In a time of soaring gasoline prices, carbon dioxide emission that are causing global warming and calls for less dependence on foreign oil, we need to think about devices that use fewer oil product. I've discovered a few that do not require gasoline, ethenol, hydrogen or fuel made from coal. Most of these devices have the additional advantage that they increase muscle power and aid in reducing unwanted weight. Here they are:
The Engineless Lawn Mower.
The Engineless Lawn Mower.
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