The atrium in the Dallas Hilton Anatole hotel is Texas big, lofting more than 150 feet in the air. Owner Harlan Crow — legendary real estate investor and eccentric collector of ego-sized dead dictator

The impulse to be social is so deep-seated in human consciousness that it’s even evident in the womb, suggests a new study on the interaction of twins just a few months after conception.

Twin pregnancies offer “the unique opportunity to explore social behavior before birth,” wrote researchers led by psychologist Umberto Castiello of Italy’s