25-year-old Charu Thomas, who earned an engineering degree in 3½ years after completing high school in three years…founded supply-chain software firm Ox at age 18, raised $3.5 million in funding and, in 2020, made it onto Forbes’s 30 Under 30 list…on a recent morning from her Bentonville, Ark., office. She had just spent much of the night in the office to oversee a Fortune 500 client’s software deployment, she said, then attended a 9 a.m. staff meeting still in the T-shirt she’d worn the day before….