A roughly fist-sized lump of your brain seems to be responsible for all the vision processing. It is as power-hungry as its size suggests. Ever wonder why you

A roughly fist-sized lump of your brain seems to be responsible for all the vision processing. It is as power-hungry as its size suggests. Ever wonder why you can't really seem to read properly when you're hungry and tired? That part of your brain is in power-saving mode.