Daniel Barenboim

It's funny, because in 1970 I met the Beatles quite by a chance at a party. It was the Beethoven bicentenary, and I was then also playing the Beethoven Sonatas. And that's all they wanted to hear about - I wanted to talk about them, and all they wanted to talk about was Beethoven.

The price of diamonds can vary greatly depending on size, cut, color, and other factors, including whether they have a history. But because of the rarity of blue boron diamonds, they often fetch more money than gems of similar quality.

In 1967, the world health community launched a global effort to eradicate smallpox. It took a coordinated, worldwide effort, required the commitment of every government, and cost $130 million dollars. By 1977, smallpox had disappeared.