1) Proportion of live births worldwide affected by Down syndrome: about 1 in 650
2) Most oysters eaten in three minutes (by Norwegian Rune Naeri, 2003): 187
3) proportion of 65-year-old women with noticeable chin hair: 10%
4) Length of healthy sperm: 0.05 millimetres; top speed: 50 microns/sec; time to reach fallopian tube: 1hr
5) Proportion of animal species that are insects: 75%
6) Proportion of people with symptoms of bowel cancer who ignore them: one in three
7) Proportion of males who are colour blind: 7%; of women: 0.4%