A magnetic stirrer spins a pellet in a graduated flask filled with a liquid solution at the Gwinnett Technical College Bioscience Laboratory at Gwinnett Technical College in Lawrenceville, GA on Friday, Mar. 20, 2015. USDA photo by Lance Cheung.
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/people/41284017@N08">U.S. Department of Agriculture</a>
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Lance Cheung/Multimedia PhotoJournalist/USDA/Lance Cheung
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/usdagov/16714736457/">20150320-OSEC-LSC-0039</a>