The first American nuclear reactor built from scratch in decades has started operations.

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Third Major COVID-19 Vaccine Shown to Be Effective and Cheaper
Pharmaceutical company AstraZeneca said Monday that late-stage trials showed its coronavirus vaccine was up to 90% effective, giving public health officials hope they may soon have access to a vaccine that is cheaper and easier to distribute than some of its rivals.
Pfizer, BioNTech Seek Emergency Use of COVID-19 Shots in U.S.
Pfizer said Friday it is asking U.S. regulators to allow emergency use of its COVID-19 vaccine, starting the clock on a process that could bring limited first shots as early as next month and eventually an end to the pandemic -- but not until after a long, hard winter.
Europe, U.S. 'Climate Guardian' Satellite to Monitor Oceans
A satellite jointly developed by Europe and the United States being launched this weekend will greatly help scientists keep track of the rise in global sea levels, one of the most daunting effects of climate change, a senior official at the European Space Agency said Friday.
Why the COVID-19 Vaccines Must Be Kept So Cold
The use of mRNA technology in COVID-19 vaccines is groundbreaking for a number of reasons. However, there is a drawback to the vaccines: they have to be stored in brutally cold temperatures.
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