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US President Barack Obama holds a homemade spacecraft that was attached to a weather balloon and launched 78,000 feet up into the atmosphere by 11-year-old Rebecca Yeung (L) and 9-year-old Kimberly Yeung (R) as he tours the 2016 White House Science Fair in the East Room at the White House in Washington, DC, April 13, 2016. / AFP PHOTO / SAUL LOEBSAUL LOEB/AFP/Getty Images
US President Barack Obama holds a homemade spacecraft that was attached to a weather balloon and launched 78,000 feet up into the atmosphere by 11-year-old Rebecca Yeung (L) and 9-year-old Kimberly Yeung (R) as he tours the 2016 White House Science Fair in the East Room at the White House in Washington, DC, April 13, 2016. / AFP PHOTO / SAUL LOEBSAUL LOEB/AFP/Getty Images

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