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Shockingly, however, spending most of your time in close proximity to 500 pounds of liquid mercury is Not Great For One’s Health and tons of lighthouse keepers started to go crazy from the whole. Mercury poisoning thing. Hence why there are a lot of “haunted” lighthouses or wickies that lose it and maybe do a bit of manslaughter.

In a letter written on April 19, 1825, Augustin Fresnel proposed the use of mercury to reduce the friction in revolving lenses. His statement follows: “I propose to float our rotating devices, of the first order, in a bath of mercury, instead of placing them on rollers. This project won't present many difficulties; nevertheless, as I have not put it into execution, I won't require you to adopt it for your first lighthouse.”

Fresnel’s plan for mercury flotation was not put into practice until 1890 when Monsieur Leon Bourdelles, Chief Engineer of the French Lighthouse Service, designed and built a workable mercury flotation system. The mercury bath allowed the lens to operate in an almost frictionless environment and, additionally, allowed the speed of rotation to be dramatically increased.

It mattered for optics reasons.

Under less-than-ideal conditions, you can only see the beam when it’s pointed more or less directly at you. In-between beams you would not be able to see anything. One solution to this was to create multiple beams, and the lenses Mr Fresnel designed usually created 8 beams. But, even still, duration between flashes could be as long as one minute in the old mechanical roller systems.

The nearly frictionless operation of the Mercury suspension system allowed the lenses (large pieces of precisely ground glass weighing several hundred pounds in some cases) to rotate fast enough that they could be redesigned to create fewer (usually 3) beams. Fewer beams from a similar light source will be proportionally brighter, and the gains in speed were sufficient that duration between flashes could still be reduced to as little as 10 seconds.

This was a big upgrade. It didn’t just make the lighthouse signal faster, it allowed them to completely overhaul the lens and derive more visibility from a light source.

in addition, because section 504 relied heavily on the civil rights act and on racial desegregation of schools in order to pass, if section 504 is declared unconstitutional, it will also weaken the civil rights act and brown v board of education and will give precedent toward explicit racial segregation regardless of ability

regardless of location you must advocate for section 504. if you live in alaska, florida, kansas, louisiana, missouri, montana, or texas, contact your representatives and tell them they need to pull out of texas v kennedy. this is a decision that can very likely fast track the USA back into a pre civil rights era for all marginalized groups

As a white person raised in a white supremacist society, you’re gonna fuck up sometimes. That’s just a fact. But racialized people often aren’t able/comfortable speaking up when y’all do some shit because of the power imbalance/not feeling up to educating when you may be resistant/don’t think the “fight” will be Worth It.

Show initiative without making it A Struggle or playing the white guilt card. Show you actually care about them, their struggles, and the way you interact with them BEFORE they have to have a bigger Conversation with you, beyond when they need to yell about someone else being racist.

the largest eagle to ever exist (pouākai) was endemic to aotearoa

same with the tallest bird to ever exist (moa)

tuatara is only remaining species in the order sphenodontia and only exists here (for context- the other three extant reptile orders are snakes+lizards, turtles+tortoises, and crocodiles+alligators+caimans)

only two native land mammals and they're both tiny bats

kea is the only alpine parrot on earth

wētāpunga is the heaviest insect on earth

hard to condense into a quick "fun fact" but matariki is an incredibly celebration that has a lot of fascinating history and tradition behind it, totally worth researching!!

less of a fact more of a "check this out" but showing people photos of rotorua's geothermal areas is a favourite of mine

we were the first nation to give women the right to vote in 1893, almost a decade before any other country on earth!

This one hurt, her work had such a profound effect on my life, thoughts, and politics.

May her memory be a blessing