'Likes' less likely to affect self-esteem of people with purpose

How many likes did I get? The rush of self-esteem that comes with the ubiquitous thumbs-up has more people asking that question, as Facebook and other social media sites offer more ways for friends to endorse photos and posts.

What do aliens look like? The clue is in evolution

Speculating about what aliens look like has kept children, film producers and scientists amused for decades. If they exist, will extra terrestrials turn out to look similar to us, or might they take a form beyond our wildest ...

Stars with planets on strange orbits: what's going on?

All the planets in our solar system orbit close to the sun's equatorial plane. Of the eight confirmed planets, the Earth's orbit is the most tilted, but even that tilt is still small, at just seven degrees.

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