For instance, only about 1 to 2 percent of people who get a flu shot develop a fever, Live Science previously reported. That type of side effect will appear in clinical trials, but rare side effects may not crop up until after a vaccine is approved. For example, the rotavirus vaccine, which protects against a severe diarrheal disease, was approved and only later linked to an intestinal disorder called intussusception, where one part of the intestines slides over the adjacent part like a telescope, Live Science previously reported. A 2014 study linked the vaccine to 15 extra cases of intussusception per 1 million vaccinated infants — but experts note that the benefits of the vaccine outweigh this small risk. … [Read more...] about COVID-19 vaccines are on the fast-track to approval. How will we know they’re safe?
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At the same time, expanding the character limit risks disrupting the fast-moving, real-time nature of the site, encouraging people users to post more expansive paragraphs where they once might just have posted a few words and a link. This could be especially true of Twitter’s large and noisy class of professional pundits, who live to explain the day’s events through voluminous threads. … [Read more...] about Twitter is rolling out 280-character tweets around the world
"A more important question is probably why did the frogs not get even smaller?" Vences said. "In birds and mammals, who have to maintain a stable body temperature, you can understand why they cannot get smaller than a dwarf shrew or a tiny hummingbird — as the body surface relative to body volume increases as you get smaller, you are cooling more easily, so you need more energy to maintain your temperature. This only works to a certain size well above the 10 millimeters found in frogs." … [Read more...] about World’s Smallest Frog Packs Poison Punch
Cael wanted to do better. With Adam Heathcote, an ecologist at the Science Museum of Minnesota in Marine on St. Croix, and David Seekell, an environmental scientist at Umeå University in Sweden, he first developed a model that could explain the observed distribution of lake areas around the world. Using data from multiple surveys, Cael found that the number of lakes in a given area falls as the area increases according to a particular mathematical relationship known as a power law. Put simply, small lakes come in bunches, and big ones are rare: There are only 1/100 as many lakes with an area of 10 hectares as there are with an area of 1 hectare, only 1/100 as many lakes with area of 100 hectares as there are with 10 hectares, and so on. That power law and additional data suggest researchers have underestimated the number of small lakes, so Cael and his colleagues ended up with a slightly higher estimate of the total area of the world’s lakes. … [Read more...] about World’s lakes are much shallower than thought, mathematical analysis suggests
Samsung has some big plans for its new custom Android software stack. Alongside an updated TouchWiz, The Galaxy S II will ship with a new suite of applications called Samsung Hubs. It will include hubs that allow users to buy and access books, games, and music. There's also a Social Hub that will provide a unified messaging framework, potentially like Motorola's Blur. … [Read more...] about Samsung reveals 10.1-inch Galaxy Tab sequel with Honeycomb