Notes from a discussion about Hands
Recently, I found myself in the middle of a discussion with some close friends about the physics and maths that one can associate with our hands. Here are some notes from that discussion.
We apologize in advance if this post seems too factual and a bit disoriented, we couldnât find a better way to share this information.
If you stretch out your hand, you will notice that the fingers on your hand can be calibrated to be used as a protractor like so:
Want to count till 1023 just on your hands? Well, just assign each finger a binary value and chug along:
Also: Check out the binary dance by Vihart
Rock, paper, scissor, Lizard,Spock
A simple of rock,paper, scissor is by itself a lot of fun and is a playground for game theorists and mathematicians.Â
But adding new gestures to the game reduces the odds of getting a tie but increases the complexity of the game. One popular five-weapon expansion is ârock-paper-scissors-Spock-lizardâ, invented by Sam Kass and Karen Bryla.
Remembering number of days of the month
                                             Source
This picture gets thrown everywhere on the Internet to illustrate the divine connection between hands and the golden ratio.
BUT in a study using X-rays conducted at St. Lukeâs Medical Center, Chicago, it was found that only 1 of 12 bone length ratios contained the ratio phi in the 95% confidence interval.
And it was concluded that:
The application of the Fibonacci sequence to the anatomy of the human hand, although previously accepted, is a relationship that is not supported mathematically.
Drip system on a farm land?
                     Source Video
What looks like a drip irrigation system on a farm land is actually a close up of your hands when sweating.
The reason why this visualization is fascinating is because modern techniques (like full field optical coherence tomography (FF-OCT) )in Forensics can extract sweat pores information from the fingerprint offering more information about the perpetrator crucial to the investigation.
Snapping fingers and cracking knuckles
When you snap your fingers, in order to get the satisfying full âsnapâ sound , the fast-moving second finger must hit both the palm and a small portion of the third finger.
If it hits only the palm and not the third(ring) finger, there will be a significant reduction in the total âsnapâ sound. Try it out!
When you get tired of snapping your fingers, try cracking your knucles. The sharp sound that you hear is caused by the collapse of a cavitation bubble (see image above) in the sinuovial fluid present at the joint.
Fingers, shadows and the transit of Venus
If you are wondering how on earth can all of these words be possibly related, then try answering this question:
When you bring two of your fingers closer in the back drop of a light source, long before your fingers actually touch, the edges magically seem to touch each other.
Once you hypothesize a solution for this, head over here to understand whatâs actually happening.
Thatâs about it! Hopefully not everything mentioned in this post seemed too trivial to you. Each topic mentioned in this post deserves a post on its own and is a lot of fun to explore.
We encourage to play around, have fun and have a great weekend ahead.
** The structure of sign language is yet another thing that is absolutely fascinating to explore. Click here and here to quench your thirst for knowledge