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...braking. Regenerative braking converts the kinetic energy of the moving car directly into electricity using a generator. The energy is never heat in the process. The brakes work the same way a power turbine does when it converts the kinetic energy of moving water into electricity at Hoover Dam. Normal car brakes do convert kinetic energy into heat. And hybrid cars do have a set of normal brakes for use when necessary. But the heat created that way is dispersed into the atmosphere, not converted into electricity. Dexter Ford, manhattan beach, california...
...made by burning natural gas or coal in power stations, the car basically swaps one fossil fuel for another. And because it's carrying a 400-lb. (180-kg) dead-weight battery, it may even wind up using more fossil fuel and costing more to run than a normal car - with no compensating reduction in carbon dioxide emissions. Anton Ziolkowski, Edinburgh
...Shoot the Messenger If you want people to support the radical idea of rescuing rich investment bankers, don't send a rich, former investment banker (Henry Paulson) to convince them. And don't send a discredited, lame-duck President, either. As in normal life, people are more likely to believe the advice of someone they trust. There aren't many well-known experts in this field who aren't rich, but even Warren Buffett would have brought less baggage to the process than Bush...
...depends on where you stand. Just ask anyone who wants to buy a house with a subprime mortgage - they're not all evil, but these days they are exceedingly rare - or with a jumbo loan, which now carries an average rate 1.2 percentage points above a regular mortgage. (In normal times, the spread is closer to a quarter of a percentage point.) "Some people are saying, 'Credit crunch, what credit crunch?' and others are ready to cry uncle," says Greg McBride, a senior financial analyst at Bankrate.com. "It shows it really matters where you fall on the risk spectrum...
However, others argue against the notion that the U.S. forced the reforms on Islamabad. The timing of the promotions was not extraordinary and the changes were made "on the basis of merit," says Talat Masood, a retired general turned military analyst. "These postings were in the normal course of events, with many of the officers due for rotation or retirement," he says. "General Kayani used this opportunity to bring in new people according to his [priorities...