Why do we fire a second arrow? In some ways it’s obvious. We don’t want to feel bad; we don’t like it. We want to feel good. We want things to go well, and we want them to continue going well.

Why do we yawn? And four other bodily functions explained We take a look at the weird things our bodies do on a daily basis.

BBC Bitesize explores how our memories work and why we forget things ... can stop us from remembering things. Prioritise. The more you have to do, the more you're likely to forget, so being ...