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Biophysics

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Costa's hummingbird

SERENADE ME  Male Costa’s hummingbirds will twist their tail sideways to direct the sound of fluttering tail feathers toward a female when diving past her in courtship.

Micropterix aruncella

ANCIENT COLOR Scientists found microscopic texturing on the scales of moths from the Jurassic Period that resembles what’s seen today in Micropterix aruncella (shown). Those structures give the insects their iridescent colors.

cracking knuckles

TOUGH TO CRACK  The peculiar noises of cracked knuckles can be explained by bubbles in the joint fluid that collapse partway, a new study reports.

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