Sentences with phrase «free birds spin»
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Earth's magnetic field may influence the spin of these free electrons, which birds could then detect, explains biophysicist Thorsten Ritz of the University of California at Irvine, who was not involved in the Heyers study.
The V2 turbines are made from steel and aircraft - grade aluminum, are said to be quiet (less than 5 decibels over ambient noise levels), vibration - free, safe for birds and bats, and need no grid power to start spinning.