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| Energy monitors free to borrow from Wiltshire libraries Marlborough People By kaylacey | Wednesday, April 06, 2011, 18:00 All Wiltshire council-run libraries, including mobile libraries, are lending free energy monitors to householders to help them keep an eye on their electricity use. From Monday, April 4 the energy monitors ... See all stories on this topic » | ||
| 11 mostly practical ways to travel between planets DVICE Over a big enough surface, this adds up into a heck of a lot of "free" energy, and that's what solar sails are designed to harness, providing slow but steady acceleration to end up with a very efficient top speed. To be worth using, solar sails would ... See all stories on this topic » |
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