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.
Engineers aim to build machines that put people at ease. The effort reveals truths about ourselves.
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.
Replacing the annual farming cycle with perennial crops could be better for soil, water and wildlife
An expert’s view on a common-sense diet: Don’t fuss over details, and put more plants on the plate