> “micro-digitate silica protrusions” Or in Thing Explainer-speak, "little rock fingers that stick out." Its interesting that it was Spirit that detected thi

> “micro-digitate silica protrusions” Or in Thing Explainer-speak, "little rock fingers that stick out." Its interesting that it was Spirit that detected this- big new discoveries are still coming up after driving the same robot around on the planet for years! Humanity has just barely scratched the surface (as it were) of understanding Mars.