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When it comes to kids and Covid it can feel like there are more questions than answers. How do new variants affect them? How do you get back to school safely?And how will children with limited social contacts deal with classroom…

Spurred on by rising Covid cases and the spread of the Delta variant, a wave of large employers announced this week the same rule for unvaccinated workers: they must undergo regular surveillance tests. The new requirement raises a…

Mr Blinken said the United States was "leading by example" by investing heavily in clean energy. And he added some warnings to the nations he needs as climate partners. He did not name Brazil, but warned that the destruction of the…

Federal health officials said early Tuesday that the results of a US study of AstraZeneca's Covid-19 vaccine may be based on "out of date information" that "may have provided an incomplete view of the efficacy data," which casts doubt on an…

A small group of scientists and others who believe the novel coronavirus that started the pandemic could be due to a laboratory leak or accident are calling for an investigation, independent of the World Health Organization's team of…

When British zoologist George Shaw first came across a platypus in 1799, he was so confused that he looked for stings and thought someone might try to outsmart him with a Frankish creature. It's hard to blame him: what other animal has a…