Competitors in the Agriscience Fair from the Oregon delegation explain their hypothesis and experiment to Agriculture Secretary Tom Vilsack during the National FFA Convention in Louisville, KY on Thursday, Oct. 30, 2014. USDA photo.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/41284017@N08">U.S. Department of Agriculture</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/usdagov/15499497440/">20141030-OSEC-UNK-0011</a>