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4/18 Cover

Genes & Cells

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Radix balthica snail

TOUGH STUFF  Radix balthica snails can behave boldly or shyly when spooked. An individual snail's behavior appears to be linked with the strength of its shell.

Brown Bear

GOOD NEWS BEARS  Brown bears in Finland are shuffling back from near extinction and startling geneticists with the speed of genetic changes.

common frog

OFF TO THE RACES  What’s called the common frog in Europe (shown here  in Switzerland) is one widespread species even though different races vary in their potentially sex-reversing lifestyles.

Genes & Cells

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