Quick facts Dirty gardening tools and pots can spread disease from an infected plant to a healthy one. Properly cleaning and disinfecting tools and containers can reduce the spread of plant diseases.

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Oil has been shaping the destiny of the Middle East for over a century. But in the last two decades, a pattern has emerged — one that proves and indicates the political calculus behind development, ...

A version of this article appears in the February 26, 1927 issue of Science News.