USA TODAY spoke with apple breeders, growers and researchers to find the secrets of one of America's most popular fruits.

most American supermarkets sold only a few apple varieties – Red Delicious, Golden Delicious and Granny Smiths. “It was red, yellow and green. That was it,” said Carolina Torres, a professor ...

A good human picker can do about 2,000. Not so long ago, most American supermarkets sold only a few apple varieties – Red Delicious, Golden Delicious and Granny Smiths. “It was red ...

A good human picker can do about 2,000. Not so long ago, most American supermarkets sold only a few apple varieties – Red Delicious, Golden Delicious and Granny Smiths. “It was red, yellow and green.