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19608
Humans vocalize primarily non-harmonically (talk), but some can also vocalize harmonically (sing). Birds, likewise, mostly vocalize non-harmonically (chatter), but some can vocalize harmonically. It would be most helpful, when discussing birds, mice, and whale “songs,” if scientists would clarify whether they mean non-harmonic or harmonic vocalizations. Peter WilsonSimi Valley, Calif.
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Bad Readout from DNA: Genes that act on brain may promote dyslexia
Studies conducted in the United States, Germany, and England indicate that two genes, both located on chromosome 6 and involved in orchestrating neural migration in developing brains, contribute to the severe learning disorder known as dyslexia.
- Physics
Light Pedaling: Photonic brakes are vital for circuits
A novel silicon microchip device slows and varies light-pulse speeds—a function considered critical for the development of photonic circuits based on light instead of electrons.
