The trails are a reminder of our insignificance. We come and go, but nature is forever. It puts us in our place, underscoring that we are not lords of the universe but components of it...So when the world seems to be falling apart, when we humans seem to be creating messes everywhere we turn, maybe it's time to rejuvenate in the cathedral of the wilderness - and there, away from humanity, rediscover our own humanity.

A little bit of attention can go a long way.

The photos were taken by African Union soldiers. People in Congress saw them. I thought if people could see them, there would be public outcry. No one would be able to say, We just didn't know what was going on there.

Laws matter, but typically changing the law by itself accomplishes little.

We tie ourselves in knots when we act as if democracy is good for the United States and Israel but not for the Arab world. For far too long, we've treated the Arab world as just an oil field.

Isn't it time to talk not only about weather, but also about climate?

When anesthesia was developed, it was for many decades routinely withheld from women giving birth, since women were "supposed" to suffer. One of the few societies to take a contrary view was the Huichol tribe in Mexico. The Huichol believed that the pain of childbirth should be shared, so the mother would hold on to a string tied to her husband's testicles. With each painful contraction, she would give the string a yank so that the man could share the burden. Surely if such a mechanism were more widespread, injuries in childbirth would garner more attention.