1- The Hydrogen Economy

Instead of guzzling imported oil (and being at the mercy of oil suppliers) we could turn water into hydrogen and burn that (or use to charge fuel cells.) Meanwhile, the only byproduct of the combustion of hydrogen is … more water! However, hydrogen storage remains a thorny issue, due to its low density, and hydrogen may end up being only one of many interlocking components that replace the current oil economy.

2- Therapeutic Cloning 

Forget the stories about generating identical copies of a particular sheep or person. The whole idea behind cloning all along has been to grow replacement organs or tissue in a vat, which the body would see no reason to reject. Cancerous or damaged organs could be replaced by new, disease-free clones of themselves.

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