10 things we didn't know last week

Tinder app

1. Tinder users are given a secret rating that only Tinder can see.

Find out more (Fast Company)

2. A kangaroo can appear as though it's mourning for its dead mate when in fact it's trying to have sex with it.

Find out more

3. Samosas are officially considered a luxury in the Indian state of Bihar.

Find out more

4. There's a mathematical formula for slicing pizza equally if some people eating it don't like the toppings in the middle.

Find out more (New Scientist)

5. A crocodile the size of a bus used to live in what is now the Sahara desert.

Find out more (Washington Post)

6. The Ku Klux Klan didn't always wear hoods.

Find out more (Smithsonian Magazine)

7. The older a person gets, the less likely they are to understand sarcasm.

Find out more (The Times)

8. Dogs can recognise human emotions.

Find out more (Daily Telegraph)

9. Major Tom from David Bowie's Space Oddity (and Ashes To Ashes) may have been named after Tom Major, the father of prime minister John Major.

Find out more (The Guardian)

10. You get free anti-slip shoe covers if you are over 70 and live in the Finnish town of Ypaja.

Find out more (FiveThirtyEight)

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