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Tiny, robotic fish powered by human heart cells suggest that scientists are getting closer to their goal of building replacement hearts from living tissue.

The comet was discovered less than a year ago near the orbit of Jupiter. Now, observers in North America can see it in the northeastern sky around sunrise.

On ABC's This Week, Treasury Secretary Timothy Geithner opened the door to a middle-class tax hike. The White House quickly slammed it shut. But many experts say Geithner was right to leave the idea on the table, and a recent Gallup Poll shows Americans are generally satisfied with the amount of taxes they pay.

After months of COVID, flu and RSV infections, parents of little kids are kinda losing it. But the data shows kids have always brought home waves of respiratory illness.

The Downeaster rail corridor has new federal funds to draw up plans for several big projects, which include relocating the station in Portland, adding a new stop in Falmouth and potentially extending the line to Rockland.

Rising rivers are stranding endangered riparian brush rabbits in California. Wildlife officials are searching out and relocating hundreds of them to help protect the species.

The Biden administration is moving ahead with what could be the largest national marine sanctuary in the continental U.S. A Native American tribe is hoping to be partners in managing it.

The FDA issued revised guidance about how often to test after exposure to someone with COVID or after symptoms occur. It's not exactly the same as what the CDC says. What's the best way to proceed?

Bread geeks, take note! The new technique, developed in a lab in Naples, involves the smart application of materials science and physics to make airy, bubbly dough without fermentation.

Our call-out on Facebook for people to share their experiences of the health care system yielded wrenching tales of bankruptcies, medical errors, and delayed or foregone treatment.