From medicalschool, watch this time lapse clip of how bacteria reproduce by dividing into two every 20 minutes. 

Bacteria are microscopic single-cell organisms that are found in the air, inside and on our bodies, in the dirt, and everywhere in nature. There are both harmful and beneficial kinds. Some cause diseases, while others help our bodies function. For example, there are more than 400 types of bacteria live in the human digestive system. There are also kinds that are used to make medicines, and others that make foods like cheese and yogurt. (Might anyone know what kind of bacteria this is?)

More mentions of bacteria are in these videos.

Easy experiment: Drink orange juice. Brush your teeth. Drink orange juice again. What just happened?

From Bytesize Science, an explanation as to why most toothpastes change the taste of orange juice. The video includes an intro on the five basic tastes that we’re able to detect: sweetness, sourness, saltiness, bitterness, and umami — a Japanese word that we’ve borrowed to describe a “pleasant savory taste” or “a pleasant, brothy or meaty flavor” — and the ingredients of toothpaste.

More videos about the body and how things work.

How does a virus invade your body? With the help of medical animator David Bolinsky, Robert Krulwich explain step-by-step in this NPR video from 2009. There’s also more to read at Krulwich Wonders.

Another NPR favorite: Catching Up with the Flu. Or watch more videos about how bodies work.

jtotheizzoe:

A pretty eye-opening look at just how much “stuff” your body makes in a year, from BuzzFeedVideo.

Snot a bad video. Urine for a real educational experience. Hair’s a great video to not watch before lunch.

More videos about the human body and growing await in the archives.

This human eye video close-up, via io9’s Incredible Photographs of Fractals Found in the Natural World, was filmed by AJ Korkidakis. The one below, which isn’t as crisp but goes into more detail about the eye’s different parts, is from a series on Extreme Detail: