Fossils
Could Spinosaurus swim? That would make it a game changer
Spinosaurus fossils are challenging the longstanding claim that ancient dinosaurs were never fully aquatic. And some paleontologists still aren’t convinced.
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Physics
Scientists Say: Lepton
Leptons are a quirky class of particles. Besides electrons, they include ghostly neutrinos and hefty muons and tauons.
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Animals
Analyze This: Why the fastest creatures are neither tiny or huge
The “Goldilocks zone” for fast animal speed seems to depend on a body not being too small or so big it gets in the way of its own strength.
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Health & Medicine
Explainer: What is cancer?
Cancer is a whole collection of diseases with one thing in common: all develop when the body’s cells start dividing out of control.
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Narwhals may use their enormous lance-like tusks to play
Video shows narwhals using their tusks to prod — even flip — fish they don’t target as prey. It’s the first reported evidence of these whales playing.
