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Robotic device winds its own way through a beating pig heart

Scientists have created a surgical robot that safely guides itself through the delicate chambers of a beating pig's heart.

No screen time for babies and only an hour a day for kids under age 5, WHO advises

Children should not get any screen time until they are at least 1, and kids younger than 5 should get no more than one hour per day, the WHO says.

The real climate change controversy: Whether to engineer the planet in order to fix it

Can humans undo the worst effects of climate change by embarking on a vast geoengineering experiment? And even if we can, should we?

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