This week’s five facts:
1. Iceland and the Faroe Islands are the only countries in the world where there are no mosquitoes.
2. You can only see a rainbow if your back is to the Sun.
3. Fleas can live for a year without eating.
4. Most people have fewer friends than their friends have. This is known as the "friendship paradox".
5. The average dog is as intelligent as a two-year-old child.