NASA’s Perseverance rover spotted a mysterious rock dubbed “Skull Hill” on Mars on April 11. NASA/AFP via Getty Images What makes the rock so interesting is that it looks nothing like the ...

Click and drag on the images above to rotate the skulls. Try to rotate both skulls in the same direction and keep them similarly aligned. Whenever you see your cursor change to a "globe," click.

He elaborated: "During previous studies, we discovered by chance that there was a skull attributed to Mozart. There were ...