The National Center for Earth and Space Science Education will hold another competition for student-designed microgravity experiments to be conducted on the International Space Station (ISS). This program has been featured in Scientific American. Students in Grades 5-16 are eligible to design and propose experiments, but communities sponsoring entries from Grades 5-12 should plan to engage as many as 300 students in the competition. Participating communities with approved entries will be provided a microgravity mini-laboratory to host one experiment, plus all launch services to reach the ISS in Spring 2018 and return for analysis. Communities must express interest by the (recently extended) deadline of June 15 and commit to a 9-week design/proposal phase, September 5 through November 3.  Winning experiments will be selected by December 14 for launch in the Spring.