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Light and Shadows
Light travels in straight lines until it hits matter. Transparent, translucent, and opaque materials affect how light passes and where shadows form.
Caves, Carvings, and First Images
The oldest images do not come with labels, so viewers have to reason carefully from marks, materials, places, and patterns.
From Lexington to Independence
Fighting began when British troops marched to seize colonial military supplies in Massachusetts. Colonial militia fought back, and the conflict quickly became a war. Many colonists still hoped for a peaceful solution, but continued fighting and strong arguments for self-government pushed the Second Continental Congress to declare independence in 1776.