<p><strong><a href="http://www.nasa.gov/">NASA</a>'s <a href="http://mars.jpl.nasa.gov/msl/">Curiosity rover</a> snapped this closeup view of its tool turret flexing its seven-foot-long (two-meter-long) robot arm on August 20—the first time since landing on the red planet about two weeks ago.</strong></p><p>The car-size robotic geochemist conducted a series of health checks on itself, including unfolding its arm and making sure all five of its joints are in working order.</p><p>Like a hand, at the tip of its appendage is a 2-foot-wide (0.6-meter-wide), 70-pound (32-kilogram) turret of five tools that will be used to collect and analyze rock and soil samples on <a href="http://science.nationalgeographic.com/science/space/solar-system/mars-article/">Mars</a>.</p><p>(<a href="https://www.facebook.com/NatGeoBooks/app_410891638952880">Get the full story of Curiosity's mission in the National Geographic e-book <em>Mars Landing 2012</em></a>.)</p><p><em>—Andrew Fazekas</em></p>