One more step towards the Matrix. And of course, it's being taken right here in Japan. Actually, not far from Kyoto:
Power from blood could lead to 'human batteries'

Theoretically, it could allow a person to pump out 100 watts - enough to illuminate a light bulb. But that would entail converting all the food eaten by the individual into electricity. In practice, less power would be generated since food is needed by the body.

Good to see we're still allowing for practical concerns, like, say, living...