Wednesday

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A glacier in Patagonia, Argentina, calves, with a sudden collapse of ice. Researchers say that the activity that precedes these types of tipping points and the triggers that cause them may follow predictable patterns. Philip Stanley Dickson/iStockphoto.com hide caption

toggle caption Philip Stanley Dickson/iStockphoto.com
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Tuesday

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Richard M. Burr (R-NC), surrounded by copies of a proposed bill, during the first day of the Senate Health, Education, Labor and Pensions markup of comprehensive health care legislation. Scott J. Ferrell/Congressional Quarterly/Getty Images hide caption

toggle caption Scott J. Ferrell/Congressional Quarterly/Getty Images
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