Blood tests have revealed Terry has abnormally high levels of the female hormone oestrogen. But doctors who have examined him say they have never seen such a case and do not know what to do to reverse the process.

To determine the impact of estrogens in municipal wastewater, Kidd and coworkers seeded a Canadian lake with a synthetic estrogen commonly found in birth-control pills at low concentrations (5 parts per trillion) and studied the effect on fathead minnows. They found that the chemical was concentrated in the fish at 10000 times normal levels, leading to significant feminization of males and altered egg production in females, ultimately leading to the near extinction of the species from the lake in just under three years.

A quick look at the lengths of children's index and ring fingers can be used to predict how well students will perform on SATs, new research claims.