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Evidence of ultra-fast cosmic expansion forces us to confront the possibility that the multiverse exists. But how will we ever know? It's a problem that could leave us tangled up in knots.

Body art, made possible by a clever hack. It all started when a young student in France was riding his bike on the way to design school.

Join us in celebrating Carl Kasell's 80th birthday.

Three candidates have emerged from the pack as the country prepares to vote on Saturday. With President Hamid Karzai stepping down, Afghanistan appears poised for its first-ever democratic transition.

Risks to astronauts on extended missions include vision impairment, weakened bones and radiation exposure. There are also psychological risks from facing danger while being stuck inside a small craft.

An apprenticeship program in New York City helps lower-income and minority students break into advanced sciences. For one, the love of the stars was motivation to tackle the tough field of astronomy.