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13 Sites to Download Free eBooks - StumbleUpon
eBooks have become very popular with devices such as the Kindle and the new iPad. You can get applications for your smart phone to read PDF files and eBooks from most popular book sites. There are a large selection of eBooks and many are free. Amazon has a collection of free eBooks for their Kindle reader so be sure and check their site.
Speaking at the National Meeting of the American Chemical Society in California, MIT professor Daniel Nocera claims to have created an artificial leaf, made from stable and inexpensive materials, which mimics nature's photosynthesis process. The device is an advanced solar cell, no bigger than a typical playing card, which is left floating in a pool of water. Then, much like a natural leaf, it uses sunlight to split the water into its two core components, oxygen and hydrogen, which are stored in a fuel cell to be used when producing electricity . Nocera's leaf is stable -- operating continuously for at least 45 hours without a drop in activity in preliminary tests -- and made of widely available, inexpensive materials -- like silicon , electronics and chemical catalysts.
