Dropping Cats and Blowing Bubbles With an AK-47

Learning new things is occasionally dull, but not when those things involve stunt cats and machine guns.
There have been other videos done on the physics of how cats land on their feet; this one is a bit more fun and the explanation is well put.
Cat Flipping - YouTube Video
The second video is a bit more in depth than the first and involves shooting a rifle, specifically an AK-47, under water. As you watch, note the strange behavior of the bubbles as the gas expands and contracts after exiting the barrel. Bubble bounce is a phenomenon one can observe while scuba diving when bubbles the diver exhales briefly undulate before "stabilizing" on their shaky rise to the surface. The gas of the gunpowder explosion illustrates this phenomenon to the extreme. The host also explains cavitation; something that happens to the hull of a submarine
Underwater Gunfire - YouTube

Personal Cooling System

Here is a nifty little gadget that can keep you feel a bit cooler on those balmy 100 degree days in the southern U.S.   The Wristify unit, only a developmental name courtesy of MIT, has the ability to lower your perception of heat by cooling the skin at the wrist very small amount and tricking the body into thinking it the ambient temperature is several degrees cooler. The tech is still in the Alpha phase and has a lot of versions to progress to into a commercially viable product.
The only concern I have is: If you perceive your body as being cooler than it actually is, aren't you running the risk of heat stroke?

The device is intended to be completely wearable, with a weight comparable to a men’s wristwatch. Wristify
powers their wristband with a light­weight lithium ion battery, similar to those used in cell phones. The device’s
energy consumption is algorithmically controlled so that it can last a full day on a single charge. While they are excited with their product, team members report there is still a lot of technological and product development needed before the Wristify team has a product ready for sale. They will soon begin working with design and development firms to improve the aesthetics and functionality of the next­gen prototype. They estimate
they are still 1-­2 years away from the first publicly available product.

Mantabot

The University of Virginia has been working with robotic manta, aptly named "Mantabot", in an effort to further their research in the realm of bio-mechanics. I do not know how I missed this article last year but I like the fact the little guy looks a bit like my book cover...

Mantabot Article
Mantabot Video