Curious, indeed! Our pal Curiosity recently captured "several whirlwinds carrying Martian dust across Gale Crater" on Mars, according to NASA Jet Propulsion Laboratory. These dust devils rise up when sunshine warms the ground, prompting convective rising of air. In the video below, timing is accelerated and contrast has been modified to make frame-to-frame changes easier to see, NASA JPL explained online. | Space.com