Hank Green of Sci Show explains everything that happens when you flush the toilet in this extended educational video.
Humans have always peed and pooped, but where it goes after we’ve done our business has changed a lot. In fact: The water you just drank may well have been a part of someone’s urine just weeks ago! SciShow explains!
You can actually see sound waves as they travel through the air thanks to a clever photographic trick called Schlieren flow visualization.
Schlieren flow visualization is based on the deflection of light by a refractive index gradient The index gradient is directly related to flow density gradient. The deflected light is compared to undeflected light at a viewing screen. The undisturbed light is partially blocked by a knife edge. The light that is deflected toward or away from the knife edge produces a shadow pattern depending upon whether it was previously blocked or unblocked. This shadow pattern is a light-intensity representation of the expansions (low density regions) and compressions (high density regions) which characterize the flow.
C.G.P. Grey explains genealogy and what your relatives are called.
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CGP Grey explains who’s related to you and how, using a family tree. Have you ever heard of grand aunts? Me, neither, but if we were to use such a term, it would make sense. We just don’t. If you find it hard to keep up, Grey has all this in text at his blog.
DNews explains the science behind hair and eye color changes.
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When babies are born, their eyes and hair are one color, but change within the first few years of their life! Why do hair and eye colors change? Trace explains the process of inheriting certain traits from your parents, and discusses why the colors change!