10 things we didn't know last week

1. Beer bellies are a myth - alcohol does not target the gut.

2. Birds are suffering from the "harmful misuse" of mobile phone apps that mimic birdsong.

3. There's a previously undiscovered sixth layer in the eye's cornea - the Dua layer.

4. Cats born with two faces are known as Janus cats.

5. Chickens lost their penises because of a gene called Bmp4.

6. Until recently the US Navy had a requirement that all official messages be sent in capital letters.

7. Men are to blame for the menopause.

8. A flamingo-like pterosaur used gravel to aid digestion.

9 A protein called myoglobin allows mammals including whales and seals to hold their breath underwater for an hour.

10. Venezuelans are using mobile phone apps to locate scarce toilet paper.

Full version on the BBC