False-Napoleon was about 5'6" to 5'7", average or slightly above for his time — the myth comes from a French measurement misread as English and from British wartime cartoons.

False — Vikings never wore horned helmets. The image comes from a 19th-century opera costume, not real Viking history.

False— Einstein excelled at math. The myth likely comes from a failed entrance exam (due to other subjects) and confusion over old grading scales.