10 things we didn't know last week

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1. San Francisco International Airport has a "therapy pig" to comfort travellers.

Find out more (CNN)

2. George Osborne signed 2,056 Christmas cards each year when he was UK chancellor of the exchequer.

Find out more (Spectator)

3. Chimpanzees are as good at recognising each other's bottoms as humans are at recognising faces.

Find out more (Washington Post)

4. There are at least four recognised ways of estimating time of death - and they may produce very different results.

Find out more (California Sunday)

5. Trees on city streets may worsen rather than reduce air pollution.

Find out more (Quartz)

6. People with Parkinson's disease may be helped to write and draw by a wrist-worn device containing tiny vibrating motors.

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7. Some of the new Bank of England £5 notes may be worth more than £20,000 each.

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8. Music fans are now spending more on vinyl than digital downloads.

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9. The regular use of Caesarean sections is having an impact on human evolution.

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10. People who regularly trim or remove their pubic hair run a greater risk of sexually transmitted infections than those who do not.

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