10 things we didn't know last week

1. Silk can be made from the solidified saliva of a clam.
2. Tech start-ups valued at $1bn or more are known as "unicorns".
3. A gentle jolt of electricity can be used to help someone's muscles learn a new skill.
4. There is a computer algorithm that can recreate a Van Gogh painting in 60 minutes.



5. A starfish-killing robot could help save the Great Barrier Reef.
6. People who do not get enough sleep are more likely to catch a cold.
7. People's blind spots can be reduced with training.
8. Just nine men are registered as donors a year after the opening of Britain's national sperm bank.
9. Gorillas have individual tastes in music.
10. A bang on the head can theoretically cause a bald spot.