Can we know the answer to the question "what is life?"? Could our definitions of life blinker us to new life forms we might find in the future? 

A bun in the oven? Eating for two? So many of our common phrases regarding pregnancy presume that pregnancy involves two distinct entities —the foetus and the maternal organism in which it resides. This sort of “container model’ of pregnancy pe...

It's not uncommon to hear "human nature" trucked out to explain all sorts of phenomena from war to human nurturing and cooperation. How scientifically valid are such claims? Is there such a thing as human nature? If so, what is it? In this epis...