Puzzle of Death Valley's mysterious moving rocks finally solved For at least a century, the "slithering stones" of Death Valley—rocks, some of them boulders weighing more than 600 pounds, that move across the desert floor and leave long trails behind them—have presented a puzzle, and researchers have been trying to solve it since 1948.
Strange spikes over Siberia puzzle astronauts Houston, we have a question: What are these weird spiky shapes we're seeing as we fly over Siberia? That's what astronauts were asking this June, when the sight of strange, dark-green features running along Siberia's Kulunda Steppe left them stumped, according to NASA's Earth Observatory
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