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Radio.

Hey science nerds, happy Monday.

It's Kelso Harper, multimedia editor here at Scientific American.

I am once again filling in for Rachel Feltman while she's out because, well, the news moves fast and microphones are a pain to drag around on vacation.

Rachel will be back in your feed later this week to talk about the surprisingly mysterious science

of tattoos and back to her usual Monday routine next week.

But for now it's time to catch up on some news.

Okay, let's jump in.

Last Tuesday, the Centers for Disease Control and Prevention

endorsed what it's calling the first new

STI prevention tool in decades.

It's an antibiotic called doxycycline post-exposure prophylaxis or doxypepe for short,

and it's a sort of morning after pill for sexually transmitted infections or STIs.

...