10 things we didn't know before the 13th week of 2007

1. The UK's national time signal is accurate to within 1,000th of a second of Co-ordinated Universal Time.
2. Drinking, drug-taking teenagers are in the decline, according to a survey by the Information Centre.
3. The average water temperature of the UK's rivers and lakes is 5C in winter, 18C in summer.
4. Eight of the 10 most crowded train journeys in the UK are outside London.
5. The average duvet is home to 20,000 live dust mites.
6. Designer discount retailer TK Maxx is called TJ Maxx in the US.
7. Having a baby can cost you up to two months sleep in the first year.
8. Chimps and bonobos differ from humans by only 1% of DNA and could accept a blood transfusion or a kidney.
9. Britain's peat bogs store carbon that is equivalent to 20 years' worth of national industrial emissions.
10. Dogs can seemingly perform the Heimlich manoeuvre – a technique for helping someone who is choking.

(Source: BBC)