An unusual type of cloud might explain the sky in The Scream, and scientific verisimilitude reveals which is the real da Vinci masterpiece, new studies suggest.

Bas den Hond
Bas den Hond writes about Earth science, physics, mathematics, and language. His work has appeared in The Economist, New Scientist, and a number of Dutch general and popular science publications. Based in the Netherlands and New Hampshire, he is also the U.S. correspondent of the Dutch daily newspaper Trouw. He has a master of science in astronomy.
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Thousands March Worldwide in Support of Science
Science enthusiasts descended on the National Mall in Washington, D. C., and demonstrated in more than 600 cities and other places globally in support of science and evidence-based decision-making.