In the womb, humans are free of microbes. Colonization begins during the journey down the birth canal, which is riddled with bacteria, some of which make their way onto the newborn's skin.

Beliefs about how lying looks are plentiful and often contradictory: depending on whom you choose to believe, liars can be detected because they fidget a lot, hold very still, cross their legs, cross their arms, look up, look down, make eye contact or fail to make eye contact.

Some people, no matter how robust their stock portfolios or how healthy their children, are always mentally preparing for doom. They are just born worriers, their brains forever anticipating the dropping of some dreaded other shoe.

Biology sets the context, and that is critical, but obesity still boils down to whether a person eats too much or exercises enough.

To me, it's always interesting to see what people end up regretting, as a way maybe to avoid such regrets in your own life.

Whatever the reason for any one individual's tendency to gain weight, the only way to lose the weight is to eat less and exercise more.