When Karl Marx sat down to write the Communist Manifesto in 1848, I'm not sure many could have predicted the impact his revolutionary Communist ideas would have.

The proletarians have nothing to lose but their chains. They have a world to win. WORKING MEN OF THE WORLD, UNITE!"

- Karl Marx

Other 10 ideas that have changed the world include:

1. Self-Enquiry - Socrates
2. Meditation - Buddhism
3. Forgiveness - Jesus Christ
4. The Reformation - Martin Luther
5. Equality - Declaration of Independence
6. Religious Freedom
7. Evolution - Charles Darwin
8. Theory of Relativity - Einstein
9. Women's Suffrage
   
10. Human Rights.

As well as 10 ideas that have changed the world

see also:

• Lists of Things Changed the World
• Discoveries that Changed the world
• Inventions that changed the world