Hoo boy. Just mention the word “mystery” in conjunction with the planet Mars and all sorts of folks come out of the woodwork. Some start talking about silicon-based alien life forms or Mars-based reptiles or projectiles being tossed by little green men. The latest is that there’s an exotic mushroom on Mars, and this idea … Continue reading "Some Ideas on Where the ‘Jelly Donut’ Rock on Mars Came from — and no, it’s not a mushroom"