Science: The Chicken & the Egg

> Hens lay 15 to 20% more eggs when they live on a 26-hour day (14 hours of light, alternating with twelve of darkness) in artificially illuminated henhouses, report scientists : Rutgers University and the University of Maryland. Reason: hens feel an urge to lay eggs at 26-hour intervals—at 8 a.m. one day, 10 a.m. the next, etc.—and in an ordinary 24-hour day the time to lay eventually comes when they are asleep.

> The wondrous sulfa drugs are now being used against animal diseases. Sulfanilamide cures fowl pneumonia and several eye infections, reports...

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