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Boustrophedon ( /ˌbaʊstrɵˈfiːdən/ or /ˌbuːstroʊˈfiːdən/; from Greek βουστροφηδόν, boustrophēdon “ox-turning” from βοῦς, bous, “ox” and στροφή, strophē, “turn”; that is, turning like oxen in ploughing), is a kind of bi-directional text,
Snails with shells that coil anti-clockwise are less likely to fall prey to snakes than their clockwise-coiling cousins, scientists have discovered. The arrangement of the snakes' teeth makes it difficult for the reptiles to grasp these "left-handed" snails. The effect of this advantage on the survival of Satsuma snails is so great, say the researchers, that they could separate into a distinct species.
2010-12-08
snail evolution snake coil direction left-handed protectionSound from ultrasound is the name given here to situations when modulated ultrasound can make its carried signal audible without needing a receiver set. This happens when the modulated ultrasound passes through anything which behaves nonlinearly and thus acts intentionally or unintentionally as a demodulator.