And still the strange and intriguing sightings in photos taken by the Mars Curiosity rover keep coming: This time with the image of what looks like a humanoid figure bracketed by three bold, indented parallel lines. UFO Sightings Hotspot reported Oct. 17 that the NASA's Curiosity rover had inadvertently spied a petroglyph -- or rock engraving -- among the rust-colored stones on the Red Planet. The website noted that what looks like an etching in stone, little more than a stylized stick figure, is nearly identical to hundreds of petroglyphs engraved in columns, slabs, and rocks all over planet...