Did you know that there used to be a type of human called Hobbits that were really small? How about the fact that human brains are shrinking?
There's more to human evolution than standing upright and being related to apes - learn all about it with this video.
From ancient plagues, to brand new viruses brewed up in labs, biological weapons are the stuff of nightmares.
We delve into the ten most terrifying viruses guaranteed to keep us up at night.