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Tag: history of

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-5,000 – wheel and axle

Prior to the wheel, heavy loads could be moved by dragging sleds and the sleds could be moved with more ease if rollers were placed beneath the sleds. At some point the rollers evolved into wheels that were attached to axles which were fixed to the wheels and turned with them. Eventually, the fixed wheel […]

The Beginning of the Universe

The beginning of the universe, for beginners – Tom Whyntie View full lesson: http://ed.ted.com/lessons/the-beginning-of-the-universe-for-beginners-tom-whyntie How did the universe begin — and how is it expanding? CERN physicist Tom Whyntie shows how cosmologists and particle physicists explore these questions by replicating the heat, energy, and activity of the first few seconds of our universe, from right […]