Olds and Milner constructed new experiments that allowed the rats to press a lever. Each time the lever was pressed, an electric current stimulated the pleasure centers of the rats' brains. The rats would go into a pleasure-seeking frenzy, pressing the lever as many as 2,000 times an hour. They would ignore food and water, working themselves into a state of exhaustion and starvation. Eventually, they would die. They literally pleasured themselves to death.

He's worse than mischievous, Mr. Lane assured her sourly. There's a mean streak in that family.

An 1877 Polish mizrah (a plaque hung in the home to indicate which direction to face when praying) by Israel Dov Rosenbaum, a clockmaker, mimics the shape of a mantel clock.

Some poems, echoing the purpose of early poetic treatises on scientific principles, attempt to elucidate the mathematical concepts that underlie prime numbers. Others play with primes’ cultural associations. Still others derive their structure from mathematical patterns involving primes.