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exploratorium: Snapshot from Frank Oppenheimer’s Exploratorium: Today, with research-grade microscopes at our Microscope Imaging Station, we can witness once invisible events such as sea urchin fertilization. Frank update: 61/100. Follow 100 Days of Exploratorium founder Frank Oppenheimer at our Frank100 tag: http://exploratorium.tumblr.com/tagged/frank100 Images © Exploratorium, www.exploratorium.edu
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