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Respirocytes
Respirocytes. Image by Forrest Bishop.
OK, I'm a bit of a geek when it comes to medical technology; and this is the coolest thing I've read all day :
A respirocyte is basically an artificial red blood cell a micron in diameter, a spherical nanorobot consisting of a pressure tank that can be filled with oxygen and carbon dioxide and emulate the functions of a natural haemoglobin containing red blood cell, only with approximately 200 times the efficiency. It only takes someone with a vague background knowledge of biology to imagine what this can do. With such efficient oxygen delivery to tissues, theoretically one could hold one's breath under water for hours, or run at top speed for incredible distances without becoming breathless. Such technology has the potential to expand an ordinary human's abilities considerably beyond normal limits.

The 2020 Olympics are going to be very interesting indeed.