Leonardo da Vinci (1452-1519), the world-famous painter and sculptor, was the first to think about and logically design flying machines.The first glider was built in 1893, four centuries later. Ten years later, in 1903, the Wright brothers built the first...
The universe is made up of stars, galaxies, nebulae, and galaxies at smaller scales. Below is the most distant image of the universe taken over the years by the Muse1 instrument in the European southern obse in Chile, A new...
The source of a river In most cases, the exact location of a river can not be determined because a river has multiple sources. It collects water from many sources such as streams, underground springs, rainwater, swamps and lakes and...
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