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If you've ever put in eyedrops, some of them have almost certainly spilled onto your eyelid or cheek.

The good news is the mess doesn't necessarily mean you missed. The bad news is that medicine you wiped off your face is wasted by design — and it's well-known to the drug companies that make the drops.

Updated at 12:15 p.m. ET

Less than a week after President Trump said he is cutting off subsidies to health insurance companies, lawmakers announced Tuesday that they had a deal to restore the money and take other actions that could stabilize insurance markets for next year.

In a small, windowless room at Johns Hopkins University, pigtail macaques jump around in cages. The braver ones reach out between the metal bars to accept pieces of apricot with their long fingers.

In one cage, a monkey hangs back in the corner. At first it looks like he's all alone in there, until veterinarian Bob Adams points out, "No, he's got a friend." Another monkey is clinging to his back, almost hidden.

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MARY LOUISE KELLY, HOST:

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KELLY MCEVERS, HOST:

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MARY LOUISE KELLY, HOST:

People who have obsessive-compulsive disorder can get trapped inside a thought. It repeats itself, like a stuck song. Did I lock the door? Is that doorknob clean enough to touch? I better wash my hands again — and again.

The biology underpinning this loop remains murky to scientists, but scientists are beginning to sniff out potential genetic factors behind OCD and shed light on how the disorder affects the brain.

As part of NASA's twins study, astronaut Scott Kelly spent a year in space while his twin brother, astronaut Mark Kelly, stayed on Earth. That year on the space station makes Scott Kelly the American record holder for consecutive days in space. To get through that year, he had a routine.

The Trump administration has made a number of changes to health policy in the past two weeks, raising questions about how consumers will be affected. Will the new rules for birth control coverage affect access to an intrauterine device? Might an association health plan help bring down costs for workers at small businesses? And if you're healthy, doesn't a short-term health plan that is cheaper than marketplace coverage make sense? Here are some answers to those questions.

We take it for granted that nostalgia is an ordinary, harmless emotion. You won't get a referral for a psychologist because you've posted a childhood photo with the caption #ThrowbackThursday, or because you have a weak spot for Lucky Charms or Fruit Roll-Ups. But that's a relatively new way of thinking.

The scientist who coined the term "nostalgia" in 1688 thought of this emotion as a neurological illness caused by demons. Other scientists latched onto this conception of nostalgia as a disease. It took marketers, centuries later, to realize that nostalgia has benefits.

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