Elon Musk has 5 children— twins born in 2004 and triplets born in 2006.

In 2014, he pulled all his children from conventional school and established a secret private school called Ad Astra School.

Only Elon Musk's children and a few of his employee's children attend this special private school.

Children in the school don't take exam or get grades. In fact, there is no grade in the school.

Rather, they take part in a curriculum heavy on science, math, engineering, robotics, and artificial intelligence.

To gain admission to Elon Musk's school, students must be between the ages of 8 and 13.