20150702 - JBURG Science (MA)

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Matthew Apgar - mapgar@shawmedia.com Grace Flynn, 11, left, and Kaeden Mowen, 9, lay on the floor as a jar of water is swung in a circle above them demonstrating centrifugal force during a Getting Excited About Science program at the Johnsburg Public Library on Thursday, July 02, 2015 in Johnsburg. For more photos, visit the website at www.nwherald.com.

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Matthew Apgar - mapgar@shawmedia.com From left: Ashley Wagner, Hope Weirich, both 8, and Sophia Frasch, 7, applaud a demonstration during a Getting Excited About Science program at the Johnsburg Public Library on Thursday, July 02, 2015 in Johnsburg. For more photos, visit the website at www.nwherald.com.

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Matthew Apgar - mapgar@shawmedia.com Noel Knutson, 12, participates in a demonstration while wearing multiple goggles during a Getting Excited About Science program at the Johnsburg Public Library on Thursday, July 02, 2015 in Johnsburg. For more photos, visit the website at www.nwherald.com.

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Matthew Apgar - mapgar@shawmedia.com Steve Belliveau, left, directs Heidi Peterson on holding a spinning wheel at a 45 degree angle during a Getting Excited About Science program at the Johnsburg Public Library on Thursday, July 02, 2015 in Johnsburg. For more photos, visit the website at www.nwherald.com.

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Matthew Apgar - mapgar@shawmedia.com Presenter Steve Belliveau stretches a balloon over the mouth of a bottle containing liquid nitrogen to show the affects of the gasses inflating and exploding the balloon during a Getting Excited About Science program at the Johnsburg Public Library on Thursday, July 02, 2015 in Johnsburg. For more photos, visit the website at www.nwherald.com.