Sentences with phrase «microscopic air cavities»
Microscopic air cavities within the feather barbs are arranged just so to allow coherent light scattering [subscription required], creating a blue hue.
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If your teeth are prone to pain when you eat or drink hot or cold substances, or even when you suck in a breath of air on a chilly day, but you don't have actual cavities, then a sensitivity toothpaste that fills in the microscopic gaps in your enamel might be all you need.
Crocodiles and birds have air sacks in that cavity, and those air sacks leave the same characteristic microscopic marks Witmer found on fossil skulls.