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Largest prime number discovered: with more than 23m digits
Known simply as M77232917, the figure is arrived at by calculating two to the power of 77,232,917 and subtracting one, leaving a gargantuan string of 23,249,425 digits. The result is nearly one million digits longer than the previous record holder discovered in January 2016. The number belongs to a rare group of so-called Mersenne prime numbers, named after the 17th century French monk Marin Mersenne. Like any prime number, a Mersenne prime is divisible only by itself and one, but is derived by multiplying twos together over and over before taking away one. The previous record-holding number was the 49th Mersenne prime ever found, making the new one the 50th.
(Adaptado de Ian Sample, “Largest prime number discovered: with more than 23m digits”. The Guardian, 04/ 01/2018.)
Considerando as informações contidas no excerto anterior, qual dos números a seguir é um primo de Mersenne?
Touching thermal-paper receipts could extend BPA retention in the body
When people handle receipts printed on thermal paper containing the endocrine disruptor bisphenol A (BPA), the toxic chemical could linger in the body for a week or more. Jonathan W. Martin of Stockholm University and Jiaying Liu of the University of Alberta asked six male volunteers to handle paper containing isotopically labeled BPA for five minutes. The volunteers then put on nitrile gloves, wore them for two hours, removed them, and washed their hands with soap. Afterward, the researchers measured the labeled BPA and its metabolites in the volunteers’ urine regularly for two days and then once again a week later. The study only traced the isotopically labeled (deuterated) BPA and its metabolites, so any additional BPA exposure from other sources was not monitored.
(Deirdre Lockwood, Touching thermal-paper receipts could extend BPA retention in the body. Chemical & Engineering News, 04/09/2017.)
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More Than Just Children's Books
Krumulus, a small bookstore in Germany, has everything a kid could want: parties, readings, concerts, plays, puppet shows, workshops and book clubs.
“I knew it was going to be very difficult to open a bookstore, everyone tells you you're crazy, there will be no future,” says Anna Morlinghaus, Krumulus's founder. Still, she wanted to try. A month before her third son was born, she opened the store in Berlin's Kreuzberg district.
BERLIN — On a recent Saturday afternoon, a hush fell in the bright, airy “reading-aloud” room at Krumulus, a small children's bookstore in Berlin, as Sven Wallrodt, one of the store's employees, stood up to speak. Brandishing a newly published illustrated children's book about the life of Johannes Gutenberg, the inventor of the printing press, he looked at the crowd of eager, mo stly school-aged children and their parents. “Welcome to this book presentation”, he said. “If you fall asleep, snore quietly”. Everyone laughed, but no one fell asleep. An hour later, the children followed Wallrodt down to the bookstore's basement workshop, whe re he showed them how Gutenberg fit leaden block letters into a metal plate. Then the children printed their own bookmark using a technique similar to Gutenberg's, everyone was thrilled.
(Disponível em: https://www.nytimes.com/2019/05/20/books/berlin-germany-krumulus.html)
GLASBERGEN, Randy. Disponível em:<www.teaches.ab.ca./publications/ata0%20news-volume0%2046%2002011-12number-13/pages/cartoon.aspx> . Acesso em: 2 fev. 2016.
The boy in this cartoon