Linda Avey and Anne Wojcicki

AGE: 48 and 35, respectively
OCCUPATION: 23andMe co-founders
PREVIOUS APPEARANCES ON THE TIME 100: 0

PRO: Their personal-genomics company allows users to obtain a map of their DNA, which can then be used to look for possible hereditary risks.

CON: Competition within the field is high. And even though the company recently cut its prices, consumer genetics remains an extravagance.

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