Studying geometry is sort of a Dr. Jekyll-and-Mr. Hyde thing. You have the ordinary geometry of shapes (the Dr. Jekyll part) and the strange world of geometry proofs (the Mr. Hyde part).

It often becomes necessary to resilver the small mirror used in a microscope, sextant, or other instrument of precision.

straw hat

When wet sanding, use a wet (not dripping) sponge to smooth out taped areas.