The goal of the JaipurKnee Project was to create a prosthetic leg that was amazingly sturdy as well as amazingly cheap. That’s no easy task. Otherwise it would have been done by now. Somehow they did it and created the leg you see in the above pic. It only costs $20.

Expensive and high-tech prosthetic limbs are nothing new. But what about the majority of the world who can not afford them? Legs like the one above may not make you the bionic man, but they will let you function and walk. For cheap. Pretty awesome.

A research team at Stanford has developed a refrigeration device the size of a thermos. What’s interesting is that it uses no electricity. Zip. Zero. Nada. Zilch. Instead, it contains some kind of coolant that becomes cold when it’s exposed to heat.

Details are scarce, but the units would be fairly cheap to produce at about $50. The price makes it an ideal way to deliver medicines and cold water to developing countries as well as having a bunch of other uses a bit more noble then your next camping trip. It’s a great breakthrough. All a user would need to cool any given thing is fire, which is readily available.