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Health & MedicineThe salmon that went moo
People allergic to milk products could face potentially life-threatening risks by eating casein-treated fish.
By Janet Raloff -
AnimalsWho’s on first with hummingbird bills
A survey of 166 hummingbird species links sex differences in bill length to sex differences in plumage and to breeding behavior.
By Susan Milius -
Handsome blue tit dads have more sons
A female blue tit with a particularly dashing mate is more likely to have sons than is a female matched with a ho-hum guy.
By Susan Milius -
EarthThe Importance of Being Electric
By coordinating measurements from telescopes, planes, balloons, and a battery of instruments, terrestrial and space scientists have now placed themselves on almost intimate terms with sprites—luminous shapes that fleetingly appear high above lightning storms.