6. Write a bestselling book
What is more to writing out your idea than turning it into a bestselling book? This is one of the best ways to earn passive income. Write your masterpiece once and collect your royalty for as long as they are selling out.
Most science books bring the best royalty percentage to their authors due to its lack of editorial and promotional needs compared to commercial books.
Scientific journals or books are published just as they are. As original as it can be. Because people buy them to hear the author’s idea. To be entertained by good writing style is just a bonus.
One of the living proof of the fact that science make you rich this way is Stephen Hawking. His masterpiece, “A Brief History of Time” was sold for more than 10 million copies in 2 years. Assuming he only got $1 from each book sold, he already earned $10 million.
