The science behind being scared

It's Halloween, the time of year when many of us dress up in creepy costumes, watch fearsome films and go trick or treating...

Some people love to be frightened for fun, but others not so much.

Either way, all of us get scared sometimes. It's completely natural.

But ever wondered why our bodies react like they do - why we get goosebumps, or why our hearts beat faster?

Martin, Jenny, Ricky and Leah were brave enough to find out the science behind being scared...