10 things we didn't know before the 34th week of 2007

1. The number of pounds in circulation doubles every 15 years due to economic growth and inflation.
2. Each slug eats twice its body weight a day.
3. Performers cannot even smoke herbal cigarettes on stage in Scotland, which has no dispensation for "artistic integrity" in its smoking ban, unlike other parts of the UK.
4. Voyagers 1 and 2, launched in 1977 and still beaming back data from billions of miles from the solar system's edge, run on generators that produce 300 watts - which would power several standard light bulbs.
5. Chickens can be diagnosed with depression.
6. There are almost four times more knife-related killings as firearms killings.
7. You can be arrested for using someone's wi-fi network without permission.
8. One in 10 people claim to have had out-of-body experiences.
9. More than half the books on the fiction charts are crime titles - a genre predominately read and written by women.
10. Queen Victoria and Pope Leo XIII were among the celebrities to endorse charities.

(Source: BBC)