An early science lesson for many kids comes when a magnifying glass in the sun sets twigs (or hapless bugs) aflame. Aimed the right way, this 3x4-foot Fresnel lens from a rear projection television can melt a penny into a puddle within several seconds. (In this picture, it's harmlessly trained on company CEO Philip Cable.) The $130 lenses are among the most popular items sold by American Science & Surplus, which tracks 4,000 items in a SQL database.
Regular customers include aficionados of magazines such as Make and ReadyMade, the stars of
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