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Claudius Ptolemy described a stick appearing to bend in a pool of water, and accurately recorded the angles to within half a degree.
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Romans were experimenting with glass and found objects appeared larger when viewed through this new material.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.