Should you be pumping iron with Diesel Dave, Heavy D, or The Muscle?

Puppy Bowl XX premieres Sunday, February 11 at 2P ET/11A PT with more adoptable puppies from shelters and rescues than ever before.

Congratulations to Keaton "The Muscle" Hoskins and his fiancé Madi whose family got a little bit bigger as baby Everlee Victoria Hoskins came into the world.

Earth’s glaciers are both a precious resource and a fragile ecosystem that is disappearing quickly due to global warming. Scientists warn that glaciers will vanish from the mainland US within decades. And their rapid melting is dangerous to society and the natural systems we rely on.

Strip down to the bare essentials and see how long you'd last on a 21 day challenge.

Watch new episode of the wildest show on television with special early access on discovery+.

Japanese scientists created a self-healing skin for robots. This breakthrough study brings Westworld-like robots one step closer to reality.Is a dystopian future closer than we think?

Thanks to a complex internal structure, lizards can shed a tail in a pinch… yet keep their tails attached when they need them.

California’s coastal kelp forests could be making a welcome revival. Drone images show seaweed beds recovering along the north coast in Mendocino and Sonoma counties.

Feeding insects to farm animals could be the environmental revolution that the livestock industry has been waiting for. Insects, a rich source of protein and part of the natural diet for pigs, poultry, and fish, use a fraction of the land and water needed to raise soybeans for feed and produce lower carbon emissions.

Scientists estimate that our Sun is about 4.57 billion years old. They’re surprisingly confident about that number, too, which opens up an immediate question: how do we know that? The short answer is “a lot of science and math”, but I have a feeling you’re not here for the short answer.

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Discovery will follow the epic journey through the Drake Passage this December.

People suffering from life-changing physical conditions, like losing a limb or paralysis caused by a stroke, often have a long, slow journey to regain function. But advances in digital therapies, using games and virtual reality, can make rehabilitation easier and are encouraging patients to make faster progress.

How do you survive a nonstop row across the Drake Passage? With the hardest and coldest training routine you can think of.