Earlier work found that male stock traders made more money on days when their level of the male hormone testosterone was higher.

VOA: special.2009.02.25

Mister Gray says one major difference is the way people react to the hormone testosterone.

VOA: special.2009.03.24

These are the male sex hormone testosterone and desogestrel, a synthetic steroid found in the female pill.

BBC: '100% success' for male pill trial

Det Botha said police found two boxes of the male sex hormone testosterone and needles in Mr Pistorius's bedroom.

BBC: Pistorius witness 'heard shots, screams, more shots'

In the maternal samples, they measured testosterone, a hormone, and cotinine, a breakdown product of nicotine that shows a person's level of smoking.

ECONOMIST: The fetus is father of the man