How has the average size of elephant tusks changed over the past century and a half? Detailed answer

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How has the average size of elephant tusks changed over the past century and a half? Detailed answer

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How has the average size of elephant tusks changed over the past century and a half?

Over the past century and a half, the average size of elephant tusks, both African and Indian, has decreased by about half. Researchers directly link this data to poaching: ivory hunters tend to kill the largest individuals, so smaller elephants with smaller tusks are more likely to have offspring.

Authors: Jimmy Wales, Larry Sanger

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Why did the Americans put about 1963 million needles into orbit in 500?

In the 1950s, the main means of communication for the military with distant objects was radio waves reflected from the Earth's ionosphere. To increase the reliability of communications, the Americans wanted to supplement it with an artificial ionosphere and launched 480 million copper needles about 2 cm long into medium earth orbit. Radio signals became more powerful, but this direction did not receive much development due to the advent of satellite communications, as well as due to protests scientists who declared the inadmissibility of space pollution. A few years later, most of the needles burned up in the planet's atmosphere, but some of their clusters continue to be in orbit to this day.

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