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The Great Pyramid would remain the tallest building on Earth for over 3,800 years. No man-made object topped its height until Eiffel built his tower for the 1889 Paris World's Fair. The vast building was completed in only 20 years using the square, copper chisels, and human ingenuity.

A Light Bulb Idea

In the early days of the light bulb, no one knew what caused the filament to glow or change color at different temperatures. The attempt by would be manufacturers of light bulbs to better understand the manufacturing process would lead to a scientific revolution that gave rise to quantum physics.