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During the 1970s, astronomer became aware of a massive radio source at the center of our galaxy that they later realized was a Supermassive Black Hole (SMBH) – which has since been named Sagittarius A*. And in a recent survey conducted by NASA’s Chandra X-ray Observatory, astronomers discovered evidence for hundreds or even thousands of black holes located in
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Welcome to the age of the urban rat. There are about 2 million New York City rats, a 2014 estimate suggested, which would mean the rodents in New York outnumber the humans in Philadelphia. Do not discount the power of gnawing teeth in aggregate — Cornell University scientists once calculated rats cause $19 billion in damage annually. Rats and other