SciShow series Quick Questions host Hank Green explains the science behind why humans are ticklish. Green also explains that the concept of tickling actually breaks down into two parts, knismesis and gargalesis, and suggests tickling may be a form of self-defense training.
Description:
What’s up with ticklishness? And are other animals ticklish, too? Quick Questions has the answers!
SciShow dispels the myth that dogs can’t see color and explains how they do see the world.
Unlike humans who have three different color sensitive cone cells in their retina (red, green and blue) dogs have only two (yellow and blue). This does not mean that dogs can’t see green or red objects! It only means that they can’t distinguish green, yellow or red objects based on their color.
Alzheimer’s disease is the most common cause of dementia, affecting over 40 million people worldwide. And though it was discovered over a century ago, scientists are still grappling for a cure. Ivan Seah Yu Jun describes how Alzheimer’s affects the brain, shedding light on the different stages of this complicated, destructive disease.
Inspired by an evolution GIF she stumbled upon on Reddit, graphic designer and blogger with a bachelor’s degree in molecular biology Eleanor Lutz has created a spiraling animated infographic showing the human embryo and fetus development, from fertilization to birth.
