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Most of us have heard you need 10,000 steps a day to stave off health problems, but new research is finding that number is not necessary -- though more is always better.

We speak with James Larkin, the head of a project in South Africa that's experimenting with using radiation to prevent rhino poaching. They sedate the animals and inject radiation into their horns.

NPR's Ari Shapiro speaks with Seth Worley, director of the feature film Sketch, where a young girl's drawings of monsters come to life.

The Trump administration canceled about $500 million for research into mRNA vaccines. The move slows progress in using the technology to prevent a future pandemic or treat disease, experts say.

The Army identified the alleged gunman as Sgt. Quornelius Radford, who worked in automated logistics. The victims were Radford's coworkers and he used a personal handgun, the Army added.

Florida has been experiencing a statewide teacher shortage made worse by the pandemic and low teacher pay.

Fourteen million people in Sudan have been displaced by war and famine. The Atlantic's Anne Applebaum writes about the scale of destruction in her article, "The Most Nihilistic Conflict on Earth."

There's a fresh push to edit the genes of human embryos to prevent diseases and enhance characteristics that parents value. Bioethicists say just because it's possible doesn't mean it should be done.

The chain's bankruptcy filing is the second in seven years. Its troubles include unwieldy debt, shoppers' changing habits and new tariff costs.

The discussion of a summit came amid the countdown to President Trump's Friday deadline for Russia to agree to a ceasefire with Ukraine or face new sanctions and tariffs on Russian energy exports.