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Science News for October 3, 2001


Deadly copper disease in infants targeted

Menkes' disease is a fatal illness caused by copper deficiency, affecting male infants typically, causing death by age 3. Researchers now study the normal function of the gene involved in development and what causes its absence or defect., The disease is named for John Menkes who first described it at Columbia University in 1962.

Iron-deficient children at risk for higher blood lead levels, finds researchers at UC Berkeley

A study published in Environmental Health Perspectives found that iron-deficient children have significantly higher blood lead levels than those with normal iron levels. The researchers, led by Asa Bradman, tested blood samples from 319 Sacramento-area children and found an average blood lead level of 5.6 micrograms per deciliter in ir...

SourceUniversity of California - Berkeley·JournalEnvironmental Health Perspectives·DateOct 3, 2001

The acoustics of laughter

A team of psychologists studied 1024 laughter episodes from young adults watching funny video clips. They found interesting sex differences in laugh types and pitches, with women producing more song-like laughs than men. Laughter is surprisingly high-pitched, with some laughs reaching frequencies of over 2,000 Hz.

SourceAmerican Institute of Physics·JournalThe Journal of the Acoustical Society of America·DateOct 3, 2001