Elon Musk sold a video game he made to a local computer magazine for $500 while he was in 10th grade.

“The core of this claim is accurate, but it misstates Musk's age. In 1984, at the age of 12, Musk created the code for a video game called "Blastar." He sold the source code to a South African magazine, "PC and Office Technology," for approximately $500. However, being 12 years old would place him in middle school (around 6th or 7th grade), not 10th grade. Context: This event is frequently cited in biographies as one of the earliest examples of Musk's entrepreneurial and programming skills, demonstrating his interest in technology from a very young age.”