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Science  05 May 2017:
Vol. 356, Issue 6337, pp. 468-469
DOI: 10.1126/science.356.6337.468

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In science news around the world, the People’s Climate March draws a crowd of hundreds of thousands to Washington, D.C., a Swedish ethics panel recommends that researchers withdraw a Science paper on the dangers of microplastics to fish, the Chan Zuckerberg Initiative gives an undisclosed amount to boost the preprint server bioRxiv, a controversial bill that would merge U.K. research councils into one overarching body gets a green light from Parliament, and more. Also, Cassini dives into the gap between Saturn and its rings—revealing that the gap is surprisingly empty of particles. And the world’s tiniest cars compete on a racetrack one-hundredth the width of a human hair.