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I'm talking about a 600-year-old Chinese medical kit containing surgical tools with traces of anesthetics on their surface. It was discovered in the tomb of Xin Quan, a physicist from the Ming dynasty (c. 1348–1411). To reveal the chemicals on the surgical instruments, scientists used X-ray fluorescence. Atoms in the metal get excited & they release energy as fluorescent X-rays. The energy pattern reveals what elements the tools were made of, in this case mostly iron. They also used micro-Raman spectroscopy. Researchers removed 3 microscopic particles from the tools & hit them with a laser. Molecules vibrate when struck by light. These vibrations scatter photons in unique patterns, & the patterns equal a "molecular fingerprint." The analysis revealed aconitine, confirming the toxic residue was from wolfsbane on tweezers & scissors.

Aconitine is one of the most dangerous plant alkaloids known. The lethal dose of aconitine for humans is 1-2 mg (0.00004-0.00007 oz)—a vanishingly tiny amount. A grain of table salt is 10X heavier than this lethal dose. A single speck of black pepper dust is in the same ballpark. A dose the size of a grain of sand can kill you. Aconitine can be absorbed through the skin. You don't even need to swallow it—touching it can be enough. Aconitine numbs before it kills. So how did the Ming surgeon make it safe enough to use it without killing the patient? They peed on wolfsbane. Urine acts like a weak chemical bath that partially dismantles the poison molecule, making it less deadly but still numbing. And that's what they did. They used it as an anesthetic. Like lowering the volume of loud music, they subdued the poison.

I'm talking about the Greenland shark, currently considered the longest-lived vertebrate, according to genomic & radiocarbon dating. The radiocarbon dating works like this: Between 1952 & 1963, atmospheric nuclear bomb tests released a massive spike of radioactive ¹⁴C into the atmosphere. This spike caused the "bomb pulse." That bomb pulse of carbon entered the ocean, entered plankton, entered fish & ultimatelky entered shark tissues, including the eye lens nucleus. A shark's eye grows like an onion. The innermost layers form before birth; new layers are added outside throughout its long life, but the core never changes. So the core of the shark's eye lens is a time capsule of the shark's birth year. Scientists measured ¹⁴C levels in the eye lens core. If the core contained bomb pulse ¹⁴C, the shark must have been born after 1955, but if the core contained pre-bomb ¹⁴C, the shark must have been born before 1950—possibly centuries earlier. How much older? This is where genetics & growth cycles provide the answers.

Greenland sharks grow very slowly, around 1 cm per year (0.4 in/yr). They mature at around 150 years. This means a Greenland shark is basically a teenager for a century and a half. In biological terms, they don't reproduce until they're about 150 years old. This is the slowest maturation of any vertebrate. At the very minimum, they are at least 200 years old, but likely closer to 400 to possibly 512 years old. Even at 200 years, they are still the oldest vertebrates on Earth, beyond bowhead whales & Galapagos tortoises. Even Jonathan, the famed Galapagos tortoise, is 192-194 years old—the oldest land animal.

Why do they live so long? The genome sequence of the Greenland shark has recently been completed that shows enhanced DNA repair systems. They have robust chromatin organization. Chromatin is the way DNA is packaged, like a bubble wrap for your genome. In Greenland sharks, chromatin stays tightly regulated, preventing DNA from getting tangled or broken. This reduces mutations, the seeds of aging & cancer. They have expanded ferritin genes, the iron-storage genes. Free iron reacts with oxygen to produce free radicals that can damage cells, but the sharks' ferritin is like a safe that locks away iron, preventing cellular damage.

By about 2084, according to the gold-standard UN "World Population Prospects," the global population will officially begin its decline. Rich countries will all have become like Japan, stagnant & aging. And the rest of the world will have become old before it ever got the chance to become rich. Oh, and did I tell you that's the good news? In reality the population is set to decline decades ahead of UN expectations. None of this is good news, but it doesn't necessarily foretell extinction. Humans are very resilient & are not dumb. We survived ice ages, plagues, famines & near-extinction bottlenecks. One way to counter the problem is massive immigration. That, of course, is a double-edged sword because nations shrink as humans are distributed. Countries can die, but the species won't. A fertility of 1.0 halves the population but never hits zero. Even a fertility rate of 1.0 still produces children—just not enough to maintain population size.

We adapt through technology & economic incentives. When labor becomes scarce, societies adapt through automation, AI labor, pro-natal policies, immigration incentives & reproductive tech such as IVF, gene editing & artificial wombs. There are risks to low birth rates. They include economic contraction (fewer workers, slower growth, shrinking tax base). A world where 40-50% of people are over 60 is mathematically unsustainable under current systems, which would strain pension & healthcare systems. There could be regional extinction. Nations, languages & cultures can disappear. Examples already underway include rural Japan, Italian hill towns, Bulgarian villages, the South Korean countryside & Baltic regions. Young people drive inventions. A world composed mainly of retirees drains the economic system & innovates less.

That poppy seed bagel you consume can still register enough opium on a standard drug test to register a positive result. A single poppy seed bagel or muffin has about 1-2 tsps. of seeds (3-6 g). The seeds often carry morphine & codeine residue from the opium poppy's sap. Morphine is the major opiate, but thebaine, papaverine, & noscapine are also present. You don't need a mountain of seeds—just a normal breakfast pastry can do it. I love poppy seed bagels, & I'm not worried about them because I don't plan on entering any athletic events that require testing anytime soon. The question is whether washing the seeds will remove all traces of the opiates. It is the contamination level, not the number of seeds, that is the real driver. Two identical bagels can differ dramatically. If you have poppy seeds on your bagel or pastry, it's enough to risk a positive result. Morphine is detectable for 6-48 hours in the urine, & how fast your metabolism works will also determine excretion. Your kidneys dump morphine fast—but not fast enough to save you from a Monday morning drug test. Commercial poppy seeds are washed, but even so, the seeds can carry 0.5-250 μg (microgams) (1 millionth of a gram) of morphine per gram.

Poppy seeds themselves do not produce opioids. The opium latex from Papaver somniferum (the Latin botanical name of the flower) translates as "sleep-bringing poppy." The latex coats the seeds during harvesting. Washing seeds is not standardized. Some seeds are lightly rinsed; others are aggressively washed, so contamination varies by 500-fold between batches. Even after washing, morphine sticks to the seed coat, codeine remains in smaller amounts, & baking does not destroy these alkaloids. People who make poppy seed tea often use 1/2-2 cups of unwashed seeds (which you can order)—a known overdose risk. Morphine is the proverbial double-edged sword. It can induce sleep, but the wrong dose can induce sleep permanently. CDC & Canadian coroner-reviewed cases document multiple fatal overdoses. Morphine is part of the wider opioid-overdose crisis. 20 tbsp (160 g) of seeds is enough to kill. Morphine is a very effective painkiller & is administered under strict hospital guidelines, often 2-10 mg IVG at a time. Should overdoses occur, naloxone is administered to reverse toxicity by kicking opioids off their receptors & sitting in their place.

This is not a hypothesis—it is real—and in this case applies to the Amazon molly, a fish. The female mollies give birth without ever using the males' DNA. Females have survived 120,000 years by using parthenogenesis—a reproductive system where females produce daughters from unfertilized eggs. Think of it like biological photocopying; each daughter is nearly a genetic clone of her mother. Their eggs self-activate—they begin dividing without male DNA. Because unfertilized eggs have 1/2 the DNA, the fish uses tricks like "autoixis," where the egg fuses with a copy of itself, & "endoreplication," where the genomes duplicate internally. The reason the lineage doesn't collapse from the buildup of mutations is that the original female species 120,000 years ago originated from a hybridization event between two very different species. This gives them extra genetic diversity, extra chromosome sets & built-in robustness.

The "geniuses" in this case are octopuses at Dartmouth College in Hanover, New Hampshire, who used a mirror to locate prey hidden behind them, choosing the correct location 73% of the time, far above chance—making them the first invertebrates ever shown to use a mirror as a spatial tool. In the experiment, three California two-spot octopuses were trained to choose the correct side of the tank based on the mirror's reflection. Researchers placed food behind the octopus, out of direct sight. A mirror showed the food's reflection. To succeed, the octopus had to understand, "What I see in the mirror corresponds to something in the real world over there." This is not self-recognition (like dolphins or chimps), but spatial inference, a completely different cognitive skill. Octopuses have about 500 million neurons, with over 2/3 in their arms, giving them semi-independent "mini brains."

Octopus brains have no cortex & no hippocampus like other vertebrates, yet they still learn, plan, solve puzzles, use tools & escape from aquariums, like Inky, who was housed in New Zealand's National Aquarium & made a great escape. He slid out of his tank, crawled across the floor, squeezed through a 6 in. (15 cm) drainpipe & vanished into the Pacific Ocean, never to be seen again. Before this study, only vertebrates—monkeys, birds, & some mammals—had ever used mirrors to locate hidden objects.

The scene is the South American forests of Ecuador, Colombia, Brazil & Venezuela, where the most unusual predation is taking place. The predator is a harvestman named "Daddy Longlegs," who surprisingly has developed a taste for live frogs, which are 1.29 times the size of the harvestman. The body length of daddy longlegs is around 0.1-0.4 in (3-10 mm), while the frogs they are eating range in size from 0.5-1 in (12-25 mm). They are called "long legs" for a good reason. Their legs are 5-6X longer than their bodies, exceeding 4-6 in (10-15 cm). They are not spiders because they fall under the order Opiliones, while spiders are in the order Araneae.

Spiders have different anatomy & live a completely different lifestyle. Spiders have 2 body segments, while daddy longlegs (harvestmen) have one fused body. Harvestmen have no venom glands; spiders do, which are connected to fangs. Spiders make silk from spinnerets; harvestmen make no silk. Spiders liquefy their prey before eating by injecting digestive enzymes; harvestmen have chewing mouthparts instead. Spiders eat insects, other spiders & sometimes small vertebrates such as frogs, geckos, lizards, snakes, birds, bats & rodents. You may not have known this, but spiders can do that because they use their venom to paralyze prey, their fangs pierce the prey's skin, & they even trap their prey in silk. You would think that silk would not be strong enough to hold prey that is bigger & much heavier than they are, but you would be wrong. Orb-weaver silk is stronger than steel by weight. Spiders don't chew the way harvestmen do; instead, they inject digestive enzymes, liquefy tissues & drink the soup.

Meanwhile, daddy longlegs (harvestmen) have no venom, no fangs, & no webs, yet shockingly, they too eat frogs. It's like discovering a goat that suddenly hunted & ate a rabbit. Scientists always thought harvestmen ate soft-bodied insects (aphids, mites), worms & caterpillars, rotting fruit, fungi, bird droppings & occasionally small dead animals. So how does a daddy longlegs eat a frog? They use tiny pincer-like mouthparts, "chelicerae," to tear food into small pieces. They don't swallow prey whole; they shred it bit by bit. They rely on strength, relying on exceptionally strong front limbs called pedipalps to restrain struggling frogs, using them as grappling hooks. They ambush frogs when the amphibians are sleeping, resting, or hiding in leaf litter. Frogs are slow to react in cool nighttime temperatures, which is often when the huntsmen ambush them.

I'm talking about Ötzi the Iceman, who is named after the Ötztal Alps, which are partly in Austria, although his frozen body dated 5,300 years ago, actually lay inside Italy on the border with Austria. The poor guy was murdered by a copper-tipped arrowhead embedded in his left shoulder, deep enough to sever the subclavian artery—a major vessel that supplies blood to the arm. He would have died within minutes. The perpetrator was someone ambushing him from behind. Forensic analysis suggests Ötzi was in a fight before the attack. Ötzi fell after being shot & hit his head. Ötzi was notable for the 61 tattoos preserved on his body, making him the oldest tattooed human ever found. Tattooing itself is far older—probably tens of thousands of years older—but older examples are not preserved on skin, so we lack direct evidence.

There is something else about Ötzi that was found—yeasts isolated from the surface of his skin where they colonized shortly before his death & then froze in place for 5,300 years, & yeasts were also found in his gut, preserved along with his stomach contents that showed that he ate ibex, red deer & einkorn wheat shortly before his death. The yeasts survived because of glacial freezing, low oxygen, cold-adapted physiology, cold-adapted yeasts, rapid post-mortem cooling, & kept cold in the museum where his body is preserved (-6°C/21°F). Ötzi's body still contains living, metabolically active yeasts that may have lain dormant for millennia. And perhaps the strangest part of the yeast story is that scientists cultivated the yeast to make a sourdough that they say "tasted 'very, very good.'" Described as "earthy, aromatic, slightly fruity, & deeply fermented."

I'm talking about the male octopus's arm, which it uses to find the female octopus's ovary, which is hidden deep inside her mantle cavity, which is the large muscular "bag-like" body behind her head & eyes. Visually, there is no way for the male octopus to see it as it's dark, enclosed, & filled with moving tissues, gills & organs. Yet the male always finds it. How? By relying on chemical sensing & touch navigation through his specialized mating arm called the hectocotylus. The female's reproductive tract releases progesterone & related steroid signals, which diffuse into her mantle cavity. His hectocotylus suckers contain chemoreceptors that can "taste" these hormones & are drawn to them like a magnet. Octopus arms contain 10s of millions of neurons & can perform complex movements without a central brain.

Bumblebees were trained to solve a two-step puzzle box to obtain a sugary reward, & other bees learned the technique socially—by watching the trained demonstrator—despite being unable to invent the solution on their own. This shows that bumblebees possess advanced social learning, potentially even primitive cumulative culture. The answer to receive the sugary reward was complex because the puzzle box required two steps: perform action A (e.g., sliding or rotating a component) & then action B, which was a separate & completely different manipulation. Only after both steps were performed correctly would the sugar solution become accessible. They had to understand that step 1 unlocks step 2, & step 2 unlocks the reward. They used their legs & mandibles to push, pull, or rotate components. This is far more complex than typical bee foraging tasks.

I'm talking about the Gila monster. Why "monster?" Because it is stocky, slow, but intimidating, it's covered in bead-like scales & is known to bite & hold on. To 1800s settlers, anything venomous & unfamiliar that possessed venom & could kill was named a "monster." But the lizard is only about 1.25-2 ft (38-56 cm) & weighs 3-5 lbs (1.3-2.3 kg). It's called "Gila" after the Gila River, which flows through Arizona & New Mexico. It's also found in Mexico. They are shy & slow & avoid humans, but up to 10 humans have been bitten by them, mainly when people try to pick them up, someone harasses them, or someone steps on them. Their bites hurt like crazy, but no confirmed deaths have occurred. Their diet consists of eggs, on which their jaw muscles are built. They also eat newborn mammals, nestlings, young reptiles & carrion (dead animals).

Their venom is basically a pain & inflammation cocktail, not a "kill you in minutes" venom. It consists of proteolytic enzymes (that break tissue down slowly), inflammatory agents causing swelling & pain, hypotensive chemicals that lower blood pressure, & special digestive molecules that help pre-digest prey. Their venom also consists of a 39-amino acid peptide called exendin-4. "4" refers to the 4th peptide in the exendin family. The 4th peptide turned out to be a miracle because it was very similar to a gut hormone in our body called GLP-1 (glucagon-like peptide-1) that boosts insulin after eating, which causes blood sugar (glucose) levels to drop. The problem with GLP-1 is that it doesn't stay for longer than 1-2 minutes. That's because an enzyme known as DPP-4 (dipeptidyl-peptidase) destroys GLP-1 within a minute or two. To the surprise of researchers, exendin-4 did the same things as the GLP-1 hormone but remained in the body for hours, even days, because the peptide resists DPOP-4 so it can last for days in the body. As a result, the first diabetic & weight loss drug was launched, called Byetta.

This was in medieval times, circa 1200s-late 1700s, 500+ years. Animal trials were held across France, Switzerland, Germany & Italy. They declined by the late 1700s, as Enlightenment ideas reframed animals as non-mortals. The description of crowd sizes gives you an idea that these trials & subsequent executions were very popular, ranging from 100s to the low thousands. An interesting book written byRod Philips, entitled Cats: A History, writes that animals—especially pigs—were arrested, jailed, tried, & sometimes executed in formal courts across Europe. Believe it or not, animals were imprisoned in human jails, same as humans, while awaiting trial. Charges ranged from injury to humans to homicide if they killed a child. Unbelievably, some animals had legal representation using surprisingly sophisticated arguments, & sometimes, animals did win & were acquitted because the onus of responsibility was shifted onto the owners of the animals. Subsequently, the owners were sometimes charged with negligence or involuntary manslaughter. When the animal was still found guilty, sometimes their sentences were reduced.

The most famous case revolved around rats in 1552, & all the rats had to be summoned. But there was only one problem—they needed safe passage, & the large feral cat population made safe passage impossible. Therefore, the rats' absence was justified, & the trial could not proceed. The court accepted Bartholomew Chassene's, the lawyer's, arguments as a legitimate procedural issue. Cats were surprisingly absent from courts, likely because people were superstitious & afraid of them; they were seen as liminal, supernatural, or simply too independent to be held "responsible." In other cases, when a sow was found guilty of infanticide & executed, her piglets were acquitted because they were too young to understand or participate in the sow's murderous spree. In the case of horses, when they kicked someone, their lawyers argued that horses are easily startled, or the victim approached incorrectly, or that the horse acted "according to its nature." Many horses were released. Sometimes the sentences were commuted & the animal returned to the owner. Cruelly, sometimes the animals were mutilated so that they could no longer cause damage, but they were not killed, or they were simply banished from the village.

Donkeys & cows were sometimes pardoned for "kicking, goring, trampling, or crushing people," & medieval courts regularly saw these accidents as crimes. But sometimes a good lawyer proved the owner was negligent, sparing the animal execution & the owner was fined. Vermin such as rats, mice, & even insects including locusts, caterpillars, & beetles were put on trial, as well as weevils & moles. Their crime? Eating grain stores, destroying vineyards, ruining barley, wheat, rye, or oats. Causing famine risk, damage to property, & threatening the community's survival. Vermin, however, were not tried in criminal courts; rather, their trials were tried in church courts because they were seen as God's creation, & their behavior was interpreted as "moral disorder." Only the Church could issue curses, excommunications, or blessings. Surprisingly, vermin sometimes prevailed. Courts ruled that even vermin have a right to live, & humans must tolerate some damage.

If Earth's history were condensed to 24 hours, this ancient fish, coelacanths, would clock in at 8 PM, dinosaurs at 10:30 PM—the fish were already ancient elders. These fish first appeared 470 million years ago, 170 million years before the dinosaurs. According to genetic research, coelacanth DNA changes at the slowest rate of any fish and among the slowest rates of any vertebrate. Their genome size is 3 billion base pairs (similar to humans). Stable deep-sea habitat, very few predators, & little environmental change are reasons for their long-term survival. In addition, they have a low metabolic rate, and a slow metabolism means fewer mutations per generation. Their mutation rate is among the lowest measured in vertebrates. They live deep. cold & quiet lives—like a creature in a museum that never needs remodeling.

The females develop eggs internally, & the embryos grow inside the mother's body for about 5 years before being born. The young hatch from eggs inside her, then emerge fully formed about 14 (35 cm) long. They emerge tail-first, ready to swim immediately. No placenta, so nutrients come from the yolk only. This is one of the longest gestations in the entire animal kingdom. The brood size is usually 20-30 pups. African coelacanths live for about 100 years. Their long life is explained by their cold, deep habitat (2,300 ft/700 m); low activity—they drift rather than chase prey; slow metabolism; & few predators. They were thought to be extinct for 66 million years until they were rediscovered off South Africa in 1938. The rediscovery shocked science—imagine finding a living dinosaur in your local harbor—that's the analogy of what happened. It was identified by J.L.B. Smith, who realized it was a living fossil.

An interesting & dare I say weird study was carried out after a nurse who worked in the operating room asked something most people would be too polite or shy to ask: "Can a fart contaminate an operating room?" It's not as silly as it sounds: during surgery, everything must be sterile. An Australian science communicator, Dr. Karl Kruszelnicki & microbiologist Luke Tennet decided to find out. They asked a colleague to break wind directly onto 2 Petri dishes from about 2 inches away: once while clothed & once with trousers down. The results were published in the British Medical Journal—hey, this is serious stuff. The result? Two kinds of bacteria on the exposed plate were described as being found on the skin and/or in the gut—either Enterococcus faecalis, E. coli, Bacteroides, or Staphylococcus epidermidis, which was found on the skin. The kicker is that bacterial transfer only occurred when the emitter was not wearing trousers (naked), but no bacteria were transferred if the farter had trousers on.

Beer is a "flavor amplifier" due to alcohol, carbonation, bitterness from hops, sugars, proteins & acids. These interact with mkolecule4as & boost their sensory impact. The CO₂ bubbles push aromas upward into your nose, alcohol acts like a solvent, & the hops' bitterness makes any harsh molecules even harsher. Volatile compounds like esters & floral molecules evaporate easily & give a pleasant, fruity, sweet aroma. These are loved by most beer drinkers. Whereas non-volatile compounds are drivers of harshness, as summarized in Chemical & Engineering News. The "bad" molecules that make some beer drinkers turn their noses, medium-chain fatty acids, can make beer taste soapy, waxy, & harsh. Oxidized hops can create a metallic, stale, or puckering sensation. To analyze beer's compounds, scientists used liquid chromatography (LC), a process that pushes beer through a long tube in which beer is separated into 100s of tiny chemical "lines," each representing a different compound.

They also used gas chromatography (GC), where volatile molecules evaporate, which highlights aroma molecules—the ones your nose detects. After LC & GC separate the molecules, this is followed by mass spectrometry (MS), which blasts them apart into charged fragments, then weighs those fragments & produces a unique molecular fingerprint. Scientists compare these fingerprints to databases to identify each molecule. MS can detect 1,000s of molecules (as in our lager beer sample) at unbelievable levels—even parts per billion (ppb) or parts per trillion (ppt). MS is the core identification tool in what is known as "flavoromics." Lager was chosen for the taste test because it is the most "neutral" of beers for human tasters. It's the best "control beer," making off-flavors easier to detect.

It's interesting to note that when several of the "bad" compounds were dissolved in plain water, trained testers could barely detect them, but when added back to beer, drinkers described the result as "harsher, sharper & more bitter." The finding points to one of the central lessons of flavor chemistry (flavoromics): taste is not simply the sum of individually detectable ingredients. Flavor emerges from complicated interactions among alcohol, aroma compounds, sweetness, carbonation, & the brain itself. The 4 nonvolatile compounds that strongly correlated with consumer disliking included feruloyl 3-hydroxyagmatine, p-coumaroyl-hydroxyagmatine, & N1, N10-diferuloylspermidine—scary names that sound less like beer ingredients & more like rejected villains from a Marvel movie.

All these molecules share a common fragment that forms the basis of cinnamon's flavor. One of the molecules, ethyl 3-methylthiopropionate, was bipolar because one part of the molecule (thiol) is notorious for some of the worst stenches in chemistry—the kind that can clear a lab of even the most hardened organic chemists in a Miami minute. The other part of the same molecule is pleasant (an ester)—a diverse class of volatile compounds found throughout nature in some of the most delightful flowery scents & fruity flavors. (Joke time)! What is the definition of an organic chemist? Someone who washes his hands before he goes to the bathroom. What happens when the two unlikely compounds join together? Strangely, you get the good, the bad, and the ugly. Some describe the beer like a sweet onion; others say it's sulfurous, fruity, tinny pineapple, musty tomato with metallic ripe & canned notes, savory green with hints of horseradish & tropical notes, cheesy, or like cabbage. (No wonder I don't like beer.)

Finally, did you ever wonder when beer was first produced & where? Beer was first produced in ancient Sumer (Mesopotamia) around 5,000-6,000 years ago. They made it from barley, baking a special bread (called "bapir"), crumbling it into water & letting wild yeast ferment it, & they would drink the cloudy, porridge-like beer through straws. A staggering amount of Sumerian grain was sent into ale, something like 40% of the total. The ordinary workman received a ration of just 2 pints a day, but senior dignitaries received more than 8 pints, some of which was used as currency. At the time, the citizens only drank ale because water came from irrigation canals, which were badly contaminated, rather than free-flowing streams. So of course, there was no coffee, no tea & no grape wine.