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Moving its hands as if it were dealing cards and walking with a bit of a swagger, a Pentagon-financed humanoid robot named Atlas made its first public appearance last week.

Moving its hands as if it were dealing cards and walking with a bit of a swagger, a Pentagon-financed humanoid robot named Atlas made its first public appearance last week.

It's evening in the universe. The stars we have are dying, and we're not making new ones the way we used to.

It's evening in the universe. The stars we have are dying, and we're not making new ones the way we used to.

Three and five are prime numbers - that is, they are divisible only by one and by themselves. So are five and seven. And 11 and 13. And for each of these pairs of prime numbers, the difference is two. Mathematicians have long believed that there are an infinite number of such pairs, called twin primes, meaning that there will always be a larger pair than the largest one found.

Three and five are prime numbers - that is, they are divisible only by one and by themselves. So are five and seven. And 11 and 13. And for each of these pairs of prime numbers, the difference is two. Mathematicians have long believed that there are an infinite number of such pairs, called twin primes, meaning that there will always be a larger pair than the largest one found.

In the relentlessly efficient world of Jeffrey Bezos, Amazon employees quickly learn when they have over-taxed the attention of their chief executive. He quietly pulls out his smartphone and starts replying to e-mails. In extreme cases, Bezos will walk out.

In the relentlessly efficient world of Jeffrey Bezos, Amazon employees quickly learn when they have over-taxed the attention of their chief executive. He quietly pulls out his smartphone and starts replying to e-mails. In extreme cases, Bezos will walk out.

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