Delaware Public Media

Merrit Kennedy

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.

Updated at 6:00 p.m. ET

Three explosions went off near the bus of Germany's Borussia Dortmund soccer team on Tuesday evening in the city of Dortmund, local police say.

The team said on Twitter that one of its players, defender Marc Bartra, suffered a broken wrist and is being treated in a hospital. The injury required surgery.

Amnesty International says there were fewer executions worldwide last year than the year before — but the number of death sentences handed down is the highest it has ever recorded.

In its annual report, Amnesty estimates that China carried out more executions than all the other countries put together. The human rights group says China put thousands of people to death. The exact figure is classified as a state secret and is not included in Amnesty's worldwide total.

North Korea is threatening "tough counteraction" after a U.S. Navy strike group was routed toward the Korean Peninsula following the rogue nation's continued ballistic missile and nuclear testing.

"We never beg for peace but we will take the toughest counteraction against the provocateurs in order to defend ourselves by powerful force of arms and keep to the road chosen by ourselves," the official Korean Central News Agency reported in English, quoting a Foreign Ministry official.

Dylann Roof, who gunned down nine people in the basement of a historically black church in Charleston in 2015, pleaded guilty to murder charges at a South Carolina state court.

In exchange, a circuit judge is expected to hand down a life sentence Monday afternoon, as The Post and Courier reported.

For the second consecutive year, aerial surveys show severe coral bleaching in the Great Barrier Reef off the coast of Australia.

While severe bleaching events have occurred three other times in the past 20 years — in 1998, 2002 and 2016 — this year marks the first time it's known to have happened two years in a row. Scientists say the damage is caused by higher water temperatures due to global warming.

In an elaborate ceremony, Thailand's king has signed the country's military-backed constitution. The document paves the way for Thailand to hold elections in the coming months, but critics say it only solidifies the power of the military.

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