By DK

ISBN-10: 146542038X

ISBN-13: 9781465420381

From making fireplace to development the instruments of the twenty first century, discover the tales in the back of the awesome principles and units that experience formed our global in 1,000 innovations and Discoveries.

This revised and up-to-date variation brings this complete overview of humanity's maximum rules modern. suggestions in technology, area, expertise, transportation, medication, arithmetic, and language are lined, besides a timeline of heritage highlighting all innovations and discoveries from the airbag to DNA, lie detectors to hormones, and funds to the symptoms of the zodiac. function packing containers delve into the main points of the lives of Isaac Newton, Marie Curie, Albert Einstein and extra, whereas remarkable photographs and archive fabrics carry their achievements to life.

Covering over three million years of rules, 1,000 innovations and Discoveries will amaze and encourage a love of background in kids.

Supports the typical center nation Standards.

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Additional resources for 1,000 Inventions and Discoveries

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MAgnetic This Chinese sundial includes a built-in compass. compAss writing brush Used in 19th- century Japan, this writing brush is made of hair set in a bamboo shaft. Pythagoras’ theorem 500 bc, where pieces of lodestone were used to guide mineral prospectors. The first real compass did not appear until ad 1100 or later. Writing brush c520 bc Pythagoras P ythagoras’ theorem states that in a right-angled triangle, the square of the longest side is equal to the sum of the squares of the other two sides.

The basic model was just a pot of water with a hole near the bottom and marks down the side. As the water ran out, its level showed the time. The flow slowed as the pot emptied, so the marks had to be closer together near the bottom, making them hard to read. An improved model, invented in about 270 bc, worked the other way around: water ran into the pot, moving a pointer to show the time. Clepsydra This is a cast of a clepsydra found at the ancient Egyptian temple at Karnak. The clepsydra dates from 1415–1380 bc.

Sumerian will live on in written form for 2,000 years. c wood. Its angled teeth cut in easy stages and create a gap wide enough for the blade to pass right through. The invention of the saw was made possible by the discovery of copper and, by 1500 bc, the ancient Egyptians were sawing planks. Western saws cut on the push stroke, but to stop them from buckling, early saws worked the other way around. Sexagesimal number system c2000 bc O ur 60-minute hour and 60-second minute come from a system devised about 4,000 years ago by the Babylonians.

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1,000 Inventions and Discoveries by DK


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