New self-stretching material developed

Although most materials slightly expand when heated, there is a new class of rubber-like material that not only self-stretches upon cooling; it reverts back to its original shape when heated, all without physical manipulation.

How iron feels the heat

As you heat up a piece of iron, the arrangement of the iron atoms changes several times before melting. This unusual behavior is one reason why steel, in which iron plays a starring role, is so sturdy and ubiquitous in everything ...

Obama brings tech firms into his cybersecurity push

US President Barack Obama called Friday on Silicon Valley to put aside distrust of the government and become allies in defending cyberspace from terrorists, hackers and spies.

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