10 things we didn't know last week

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1. You're not allowed to scream on some rollercoasters.

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2. A jar of London air will set you back £19.99.

Find out more (Evening Standard)

3. US President Barack Obama recommends you open a DJ set with Rock Steady by Aretha Franklin.

Find out more (New Yorker)

4. Grammar pedants are more likely to be introverts.

Find out more (Guardian)

5. The U-rated film Watership Down would be listed as a PG today.

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6. The Central Line is the worst on the London Underground for crime.

Find out more (Gizmodo)

7. Humans may have once lived alongside Siberian unicorns.

Find out more (History Channel)

8. Cats have a role in law enforcement.

Find out more (Guardian)

9. A woman in Michigan exchanged her Dr Pepper Twitter username for 41,000 bottles of water.

Find out more (ABC News)

10. An army of large cyborg beetles could replace drones.

Find out more (Daily Telegraph)

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