2 Christopher Hirata
The second most intelligent person in the world is Christopher Hirata, who was a genius since his childhood.
When just 13 years old, he turned heads by getting a gold medal at the international physics Olympiad.
Then, at the age of 16, he was working with NASA in its mission of conquering Mars.
Later, at 22 years old, he obtained his Ph.D at the Princeton University. Hirata is an authorized child genius and currently he is teaching astrophysics in the CIT California Institute of Technology.
Christopher Hirata has an IQ level of around 225, which if you think about it, is remarkable.
