Sometimes I think about all the hours spent making lunches, carting kids from one place to another, being up in the middle of the night taking temperatures. People who haven't had to do that have, say, read every last book up there from cover to cover and probably remember it. There are trade-offs. But more life is more life.

You want to shock the body and not be constant. Intermittent fasting is an increasingly popular way: Skip breakfast, for example. Also lifting weights, losing your breath from exercise and alternating between hot and cold temperatures. We think these measures will only get us to 100 to 122 years old. That's our natural lifespan.

Life is fragile: it thrives only in a narrow range of temperatures between freezing and boiling. How lucky that our planet is just the right distance from the sun: a little farther, and the death of the perpetual Antarctic winter - or worse - would prevail; a little closer, and the surface would truly fry anything that touched it.

Between November 23, 2002, and January 11, 2003, al-Qahtani was interrogated for 48 days at Guantanamo more or less continuously, kept awake for much of that time by loud music being blasted when he was falling asleep, doused with water and subjected to cold temperatures, kept naked and forced to perform tricks as if he were a dog.

We have chosen to bring future generations into this world of rising seas and warming temperatures, droughts and floods, heat waves and wildfires, a world in which one in four mammals and one in eight birds are at risk of disappearing forever. While the damage we've done is irreversible, that doesn't give us the right to do nothing.

Titan has no liquid water on its surface, and any liquid water beneath its surface is inaccessible to us, as far as we know. It has hydrocarbon lakes, but we don't know of any organisms that could live in those, not at the temperatures that we find on Titan. Any reference to possible life in lakes on the surface of Titan is pure speculation.

The changing climate is pushing already vulnerable communities into crisis situations. Children with asthma are forced to miss school and stay inside due to poor air quality. Day laborers and construction workers must work outside in dangerous temperatures. People without homes are unable to escape the impacts of hotter summers and wetter winters.

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