Human bodies use both types of respiration. Humans do aerobic respiration unless they are short of oxygen when they switch to anaerobic respiration. Anaerobic respiration is when an athlete is ...

Nitrogen is one of the primary nutrients critical for the survival of all living organisms. Although nitrogen is very abundant in the atmosphere, it is largely inaccessible in this form to most ...

If humanity is to become a spacefaring civilization, we'll need to sort out how to get a lot of sleep in space. After all, with today's technology, it would take around nine months just to get to Mars ...