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Editorial: The
Citizen Scientist's Most Versatile Instrument
by Forrest M. Mims III
A few years ago George E. Hrabovsky
and I were discussing the most important tool
in the amateur scientist's toolbox. My vote was
for the digital camera, and I listed many reasons
why...
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In 1992 and 1994 two discoveries
were made that have had a major impact on the
scientific community. These finds, the Schaefer
and Hebior mammoths, were discovered and excavated
in Kenosha County, Wisconsin, through the efforts
and skills of a number of individuals. More. |
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How
to Prepare
Abrasive Powders
Alvaro Amaro de Azevedo
Arrange about 200 g of washed
dried sand and put it in a ball mill (see here
or search here).
Let it crush for one hour or so and then transfer
the flour to a 200 ml glass.
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