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SpaceLittle middle ground for black holes
Black holes may not come in mid-sized versions. Astronomers expecting to find one in a galaxy cluster found a tiny black hole there instead.
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EarthCarbon caveat
Adding carbon compounds to some ocean systems may lead to a counterintuitive drop in their overall carbon content — and how much carbon dioxide the ocean could store.
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Health & MedicineDopamine fends off zzzzz’s
A reward chemical in the brain helps keep sleep-deprived people awake.
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PhysicsShort-lived particle questions long-lived theory
In sifting through the ashes of a short-lived subatomic particle called the kaon, physicists are slowly accumulating new hints that the theory of elementary particles might one day have to be modified.