Why did Madame Curie give up Lei's patent?

When Madame Curie extracted the first gram of radium 18 years ago, she announced the purification method of radium without reservation. Madame Curie's explanation is very plain: "No one should be rich because of radium, it belongs to all mankind." Human beings need people who are brave in practice, who can gain great gains from their work, never forget the blessings of the public and safeguard their own interests. But humans also need dreamers.