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In the Driver's Seat: Sexual Orientation
02:40

In the Driver's Seat: Sexual Orientation

Although opinions differ as to what determines sexual orientation, most scientists believe that for males it is primarily inborn. Simon LeVay, for example found a cluster of nerve cells in the hypothalamus that is larger in heterosexual males than...

Weighing In: Factors that Contribute to Excess Weight
02:59

Weighing In: Factors that Contribute to Excess Weight

Why have so many people lost the battle to achieve and maintain a healthy weight? Some people blame metabolism for excess weight; others think it is a matter of willpower. Both factors are affected by a person's genes, perhaps a leftover survival me...