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Top stories: manta ray ‘friendships,’ preventing suicide, and a hidden hotbed of Zika

Top stories: manta ray ‘friendships,’ preventing suicide, and a hidden hotbed of Zika
Science
Although many sharks are solitary creatures, their manta ray relatives are surprisingly social: They copy one anothers movements, play together, and will even curiously approach nearby humans. Now, scientists have discovered they also form friendships with their fellow raysloose associations that can last for weeks or months at a time.

Three suicide prevention strategies show real promise. How can they reach more people?

Many paths in life can bring someone to the brink of suicide, and a shorter phone number might seem to be a navely simple solution. But researchers have repeatedly found three strategies that seem to help: suicide hotlines, standardizing mental health care, and banning access to lethal means like guns and pesticides. Thats especially important as the rate of suicide in the United States has surged 33% since 1999.

As Zika virus raced through the Americas and the Caribbean in 2015 and 2016, it infected an estimated 800,000 people and left nearly 4000 newborns with serious brain damage. But by mid-2017, the virus had all but disappeared from the regionor so it seemed. A new analysis of Zika-infected travelers who returned to the United States or Europe in 2017 or 2018 has found that 98% had visited Cuba, which did not report any cases to world health officials at the time the countrys outbreak apparently peaked.

Century-old salmon-smeared notebooks reveal past bounty of fisheries

Finding a bunch of old notebooks covered in dried-up fish slime may not be most peoples idea of a treat. But when Skip McKinnell, then a fisheries consultant with Canadas Department of Fisheries and Oceans, discovered dozens of such notebooks in a university closet in Vancouver in 1996, he was ecstatic about the information he might be able to glean about long-dead populations of sockeye salmon.

When Earthly astronomers train their telescopes on exoplanets beyond our solar system, theyre lucky to see even a single dot of light. How can they figure out whether it might have suitable conditions for life? To find out how they might know more, a team of scientists turned the problem on its head: They took images of a habitable planetEarthand transformed them into something alien astronomers light-years away would see.
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