Robots with blood?

You have blood. Your dog has blood. Heck, spiders have blood (hint: it’s clear). And now so do robots.

Would you believe that a robotic fish has blood that is used for both hydraulics and energy? Well there is one. It looks like a lion-fish. And using this special blood instead of batteries let it last up to 8 times longer.

You can read lots more about it here, at Nature.