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Searching for life among the stars

Astronomer Lisa Kaltenegger reckons the galaxy could contain as many as 40 billion habitable planets. Here, she speaks about the search for those faraway worlds and signatures of life.

A robotic window on the human mind

Engineers aim to build machines that put people at ease. The effort reveals truths about ourselves.

Can marriage make you sick?

In general, it promotes health. But it might not if your relationship is troubled or your partner is ill. Here's why, and what can be done.

Plant, reap, repeat — and now rethink

Replacing the annual farming cycle with perennial crops could be better for soil, water and wildlife

Balance, not carbs or fat, is the key to healthy eating

An expert’s view on a common-sense diet: Don’t fuss over details, and put more plants on the plate