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How long does it take an electron to form a photon? The answer would normally be: so short a time that it cannot be measured.

Energy-efficient home improvements cost a lot up front, but eventually pay themselves off.

CAMBRIDGE, Mass.--What does it take to pick a winner in the slowly unfolding field of renewable energy ? For starters, alternatives to oil must be able to stand up on their own at some point, without a need for permanent government subsidies, said Bill Joy, once a heavy hitter in the information technology industry and now a partner in investor Kleiner Perkins Caufield & Byers’s greentech practice.

The surface of Earth is being reshaped constantly. Mountainous uplands are broken down by water and wind producing sediment that is moved by rivers to lowlands. Some of this sediment is deposited along the way, some is delivered to the coast and continental shelf, and some makes its way to the ultimate sink, the deep sea

Mobile apps are the future of the Web.