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LifeFor ducks, penis length depends on the other guys
Male genitals grow longer with more competition from other males.
By Susan Milius -
SpaceDark matter eldorado
Astronomers have discovered that a nearby galaxy has the highest density of dark matter of any galaxy known.
By Ron Cowen -
Birth of the beat
Music’s roots may lie in melodic exchanges between mothers and babies.
By Bruce Bower -
Seeking a definition
Pitch is determined by a sound’s frequency. Notes that sit in different positions on a musical scale, called tones, have different pitches. Modern Western music, for example, combines 12 tones, with the A at the middle of a piano keyboard having a frequency of 440 hertz.