ScuttleMonkey from the best-discoveries-by-accident dept.
The rover Spirit has been dragging one wheel around the surface of Mars for some time. One of the resulting gouges revealed a mineral deposit which was probably caused by a hydrothermal vent. This implies a large amount of water was present when the vent was active.
One of the chief duties of the mathematician in acting as an advisor...
is to discourage... from expecting too much from mathematics.
-- N. Wiener