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

I regret not working harder to create true friendships with other couples, not seeking out people with whom to go do things and go places - people with whom to have a few crazy, memorable bonding adventures.

When a trait is universal, evolutionary biologists look for a genetic explanation and wonder how that gene or genes might enhance survival or reproductive success.

For humans and animals alike, truly vigorous, wholehearted, spontaneous play is something of a biological frill.

Marriage, or any committed partnership, has become sacred to me, powerful and fragile all at the same time.

Friendship is two-sided. It isn't a friend just because someone's doing something nice for you. That's a nice person. There's friendship when you do for each other. It's like marriage - it's two-sided.

For at least a decade, Millennials have been stereotyped as lazy, entitled, and stuck on social media. While that may not be entirely fair, they are notoriously liberal, overwhelmingly supporting left-leaning candidates and favoring policies like nationalized healthcare and same-sex 'marriage.'

Newlyweds, they have this ideal, this picture of what marriage is like, something similar of their favorite memories growing up. If only it were that simple.