Isaac Newton, two Nobel laureates and a Mensa investment club all lost money in the stock market. Here are the 8 mental traps that cost smart investors the most, backed by decades of research, and the simple rules that help you escape every one.

Most people who lose money in the stock market were never really investing. Here are 7 research-backed warning signs you're gambling instead, a 2-minute self-test, and a 7-step reset to put the odds back in your favor.