WASHINGTON (AP) — Mars Curiosity is about to take its first sip of the red planet’s sand. But only after NASA’s rover plays bartender to make sure the dry dust is shaken, not stirred.

The rover’s scoop will dig into the sand Saturday. Then the action starts. The end of the rover’s 220-pound arm will shake “at a nice tooth-rattling vibration level” for eight hours, like a Martian martini mixer gone mad, said mission sampling chief Daniel Limonadi said.