It is, of course, a known fact that sunlight carries a lot of energy and heats up the earth’s surface everyday. When a magnifying glass is held over a piece of paper at a distance equal to its focal ...

The only slip came in 1711, when Van Leeuwenhoek boasted to a group of German noblemen that he had invented a new method of glass blowing. Most magnifying lenses at the time were either thin ...