From RR HAMILTON
In the last paragraph of the article ‘Ancient bacteria are frozen in
time’ (New Scientist, Science, 16 July), it is stated that a time span of
100 000 years represents 1500 human generations.
Presumably, 1500 is a misprint for 3500, which would correspond to the
generally accepted interval of about 30 years between successive generations.
R. R. Hamilton Surrey
