• Washing your hands makes you more optimistic.

• 11% of the world is left-handed.

• It takes 5 different parts of your brain for you to understand and laugh at a joke.

• Our brains have a negativity bias and will remember negative memories more than good ones. This helps us to better protect ourselves.

• It’s ok and “I’m fine” are the two most common lies spoken in the world.

• A protein in human saliva called histatin can help wounds heal faster.

• A beautiful face attracts more partners than a beautiful body, according to a scientific survey.

• Single people tend to be less selfish than married people, according to new research.