California's Tumbleweeds Could Grow More Menacing

California's Tumbleweeds Could Grow More Menacing
David Pardo/The Daily Press via AP

Shana Welles stands five feet eight inches tall. Not a remarkable height for a human, like Welles, but downright soaring for a tumbleweed. Welles is an evolutionary ecologist studying plants, and occasionally, out in California's Central Valley, she'll find the rare tumbleweed that goes head-to-head with her.

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