WASHINGTON--(BUSINESS WIRE)--Congressional leaders were among those who gathered in Washington, D.C. yesterday to celebrate the five grand prize winners of the 5th Annual Samsung Solve for Tomorrow Contest – a nationwide competition to raise enthusiasm for science, technology, engineering and math (STEM) education among U.S. public schools. Chosen from more than 3,100 applicants nationwide, winners from California, Mississippi, Nevada, Pennsylvania and Washington have spent the past several mon