(From left) Seventh-grader Sebastian Cooper of Jury Elementary School, eighth-grader David Wallas of Pattonville Heights Middle School, Bernard Harris, M.D., NASA astronaut, and seventh-grader David Tate of Fairview Elementary School build a raft using just two squares of aluminum foil and four drinking straws. The challenge was to see which team’s raft could float the most pennies. The middle-school students also tested their skills in estimating how many pennies their raft would hold before sinking. Forty-eight middle-school students from various area schools were chosen to attend the two-week residential ExxonMobil Bernard Harris Summer Science Camp, held on campus June 16-27. Susan Flowers and Chris Mohr of Science Outreach directed the camp with the help of residential advisers who are WUSTL students or recent graduates. Harris, who is the first African-American to walk in space, founded the camps to provide opportunities for minority students to get excited about careers in science, technology, engineering and math. He wants to help the next generation of scientists to be better prepared, more diverse and large enough in number to set the pace for the global economy.