There's still an awful lot that's not understood about how complex biological systems (like our bodies) really work. Part of the problem is that we can't just go look, since the only way to really see inside a brain (for example) is to cut it open, which by definition destroys its structure. Japanese scientists have a better idea: just turn everything transparent.

What's Novak Djokovic's secret to being one of the best tennis players in the world? Natural talent and countless hours of practice, I'm guessing. Or maybe this egg-shaped pressurized oxygen chamber. One of the two!

Researchers at Vanderbilt University in Tennessee have paired both a powered knee and ankle, working in tandem, to create a bionic limb that is just about as good as the original. It's the first prosthetic limb to use said motorized joints in conjunction, and the results are impressive to see in motion.

Getting HIV test results usually takes days for the clinic to drop the news on you, but a new credit-card-sized chip called the "mChip" only takes 15 minutes to diagnose a sample of blood. It's also only $1 and is reportedly has a 100 percent detection rate. Sounds superb, if you think you might have HIV or syphilis, right?