- Measure That
Measurement resource guide covering weight, length, temperature, and other systems of units.
http://www.measurethat.com - The MegaPenny Project
Visualize huge collections of pennies (from one to billions and billions) accompanied by data on the size of the pile, weight, and area (if laid flat).
http://www.kokogiak.com/megapenny/ - ConvertUnit.com
Metric conversion calculator to convert between different units of measurement using the metric system, british/american, avoirdupois systems, but also more exotic systems like japanese, ancient greek, biblical and old swedish measures.
http://www.convertunit.com
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