1.   And whole industries have evolved to help consumers get around those restrictions.

2.   Dr. LeDoux says that emotions are hardwired, biological functions of the nervous system that evolved to help animals survive in hostile environments and procreate.

3.   If the ability to appreciate music is ingrained in the human brain, could music making have evolved to help us survive and reproduce?

4.   Language evolved to help people get around on earth, not down inside atoms.

5.   Like other addictive substances, marijuana appears to hijack brain circuitry that evolved to help people find their way back to a food source or sexual partner.

6.   LeDoux says that emotions are hard-wired, biological functions of the nervous system that evolved to help animals survive in hostile environments and procreate.

7.   Such behavior suggests that sexuality, in all varieties, may have evolved to help the animals get along and plays a role in maintaining peace, he says.

8.   Such behaviors, they say, rely on brain circuits that evolved to help animals assess rewards important to their survival, like food and sex.

9.   This suggests that all varieties of sexuality may have evolved to help the animals get along, said de Waal.