Animals
Freshwater fish are in trouble: Here’s how we can help them
Human activities threaten the survival of many freshwater fish species. Research is now pointing to how we can best overcome those threats.
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Space
Scientists Say: Interstellar medium
Radiant energy and primordial space dust span the vast reaches between star systems.
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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.
