Merrit Kennedy

After a series of "mishaps," the Navy says it will no longer allow sailors to bring electronic cigarettes onto its ships, submarines, aircraft, boats, craft and heavy equipment.

"The prohibition applies to Sailors, Marines, Military Sealift Command civilians and any personnel working on or visiting those units," according to a statement obtained by NPR's Sarah McCammon, issued by the commanders of the U.S. Fleet Forces and the U.S. Pacific Fleet.

Could there be life under the icy surface of Saturn's moon Enceladus?

Scientists have found a promising sign.

NASA announced on Thursday that its Cassini spacecraft mission to Saturn has gathered new evidence that there's a chemical reaction taking place under the moon's icy surface that could provide conditions for life. They described their findings in the journal Science.

Canada has taken a major step toward legalizing marijuana for recreational use.

Prime Minister Justin Trudeau's government introduced legislation that would allow adults to possess, share and purchase marijuana, while also strengthening penalties for those who give or sell the products to youth.

This law has been hotly anticipated, with pot producers and the medical community watching closely.

Boko Haram militants have used 27 children to carry out suicide bombing attacks in the first three months of this year in Nigeria, Chad, Niger and Cameroon, according to a new report from UNICEF.

This marks a major increase — 30 children were used in bombings for all of 2016 in those four countries, where Boko Haram is active.

UNICEF says 117 children have been used in suicide attacks since 2014. Eighty percent of them were girls.

Wondering how many kinds of trees there are? There's now a database that can answer that.

Scientists from the U.K.-based Botanic Gardens Conservation International say they have compiled the first-ever comprehensive list of all known tree species, totaling 60,065 different kinds.

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