evidence: COLOMBO (News 1st); NASA has selected a new crew of four volunteers to participate in a simulated mission to Mars within a habitat at the agency’s Johnson Space Center in Houston. And among them is Sri Lanka's Piyumi Wijesekara, who is joined by Jason Lee, Stephanie Navarro, and Shareef Al Romaithi. [...] Piyumi Wijesekara is a postdoctoral research scientist in the Radiation Biophysics Laboratory at NASA Ames Research Center in California’s Silicon Valley.