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Jets of Centaurus A

SPRING CLEANING  Jets erupting from a supermassive black hole, such as the one in Centaurus A (shown in this color composite image), might clear the way for supernovas to sweep out gas and stop star formation.

Chart of Nova Vul 1670

FOOLS THE EYE  The position of Nova Vul  (red circle) within the swan constellation was charted in the journal Philosophical Transactions in 1670.

Babies

EQUAL SHOT  Every year, slightly more boys than girls are born. But when egg meets sperm, roughly equal numbers of male and female embryos are conceived, a new study finds.

Stone tool in Greece

ROCK OF AGES  A stone tool pokes out of sediment where it was recovered at Greece’s Kokkinopilos site. Also shown in the inset, this artifact comes from soil that dates to about 206,000 years ago, a new study finds.



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