Newton was one of the brightest minds who ever lived. And even a man like this lost millions of dollars in the stock market.

In the early 1700s, the South Sea company was the “trending stock” in England, with people wanting a piece of the new wealth being created in South America. Newton bought in early and doubled his wealth before cashing in – but then he saw his friends getting rich and bought in again… just as the bubble burst.

Newton lost £10,000 to £20,000. That’s millions of dollars in today’s money! He was so angry with himself that he banned anyone from saying the words “South Sea” in his presence ever again.

Times change, but people don’t. 300 years after Newton, people still make the same mistakes in the stock market. Here are the 7 most deadly investing mistakes that you can avoid, to save a lot of money: