Toolbox

Convert Anything: http://www.onlineconversion.com

Everything You Wanted to Know About Hardness (and then some):  http://www.calce.umd.edu/TSFA/Hardness_ad_.htm

A Handy Online Scientific Calculator: http://web2.0calc.com/

Online Calculation of an Object's Volume: http://www.onlineconversion.com/object_volume.htm

Online Calculation of an Object's Surface Area: http://www.onlineconversion.com/object_surfacearea.htm

Mathematical Formulas Galore: http://www.sosmath.com/tables/tables.html

The Engineers Tool Box: http://www.engineeringtoolbox.com/

The NIST Ceramics Division: http://www.nist.gov/mml/ceramics/