NASA astronaut Rick Mastracchio illustrates the fine points of conducting the Slosh experiment on the International Space Station for employees attending.

NASA astronaut Rick Mastracchio, standing at left, illustrates the fine points of conducting the Slosh experiment on the International Space Station for employees attending the Launch Services Program's All Hands meeting in the Neil Armstrong Operations and Checkout Building Mission Briefing Room at NASA's Kennedy Space Center in Florida.

An Expedition 38/39 crew member, Mastracchio launched to the station from the Baikonur Cosmodrome in Kazakhstan on Nov. 6, 2013, and returned to Earth on May 13, 2014, after 188 days in space. To read Mastracchio's biography, visit http://www.jsc.nasa.gov/Bios/htmlbios/mastracc.html. For more information on the Slosh experiment, visit http://www.nasa.gov/content/slosh-experiment-designed-to-improve-rocket-safety-efficiency/. Photo credit: NASA/Daniel Casper