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Mexico's prickly pear cactus: energy source of the future?

Mexicans eat the prickly pear cactus, drink it, and even use it in medicines and shampoos. Now scientists have come up with a new use for the bright green plant: producing renewable energy.

Mexico City

THE prickly pear cactus is such a powerful symbol in Mexico that they put it smack in the middle of the national flag.

It was considered sacred by the ancient Aztecs, and modern-day Mexicans eat it, drink it, and even use it in medicines...

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