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The Chinese made a compass that points south when they are on the boats going to a different destination.
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The Chinese made one of the first segmental arch birdge named the Anji Bridge.
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Alchemists accidently discovered gun powder when he was trying to find out a way to make us immortal.
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.