For centuries, the Nujiang River's 2,000-km rush through China, from the vast Qinghai-Tibet Plateau, carved not only deep, rugged canyons into the land, but also entrenched destitution. In the Lisu Autonomous Prefecture of Nujiang, where 98 percent of the land consists of near-vertical slope...
What began as a prized, bitter liquid that was used in a ceremonial fashion more than 5,000 years ago has transformed over the centuries into a sweet, smooth treat that adorns store shelves worldwide. Today, chocolate is everywhere: From hot chocolate to rich truffles, we all have our ...
By measuring the ratio of parent to daughter isotopes in a sample, scientists can calculate the time elapsed since the material's initial formation. The breakthrough in radiometric dating came in the early 20th century when researchers, such as Bertram Boltwood, pioneered the use of this ...
it is hard to deny that chocolate has become a huge part of modern society. What began as a prized, bitter liquid that was used in a ceremonial fashion more than 5,000 years ago has transformed over the centuries into a sweet, smooth treat that adorns store ...
You can use the changes in the light intensities to calculate the rate of the asteroid's rotation. Comets and Meteors Comet Kohoutek Photo courtesy of NASA A comet or a meteor streaking across the sky is an exciting sight for anyone, and a telescope can make these objects even more ...
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In 1610,Galileo Galileiused the newly invented telescope to reveal that the Milky Way was made up of countless faint stars. For the next three centuries, astronomers assumed that the Milky Way was the entirety of the universe. As telescopes improved, astronomers observed mysterious, fuzzy patches...
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How to Calculate Your Target Heart Rate: Subtract your age from 220 to get your maximum heart rate. Multiply that number by 0.65 to find the lower end of your target heart rate. Multiply your maximum heart rate by 0.75 to find the upper end of your target heart rate. ...
Age is, of course, important to rarity, but it isn't all-important. Coins were made to withstand years of circulation and, in many cases, centuries. As a result, even ancient coins are found regularly in Eurasia – the Portable Antiquities Scheme in the UK alone has recorded almost 1.5 ...