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Summary
Some discoveries are new, others old. Here, we consider one of each from NASA's Curiosity rover. The new discovery, reported by Mahaffy et al. (1) on page 412 of this issue, is a remarkable measurement of the deuterium-hydrogen (D/H) ratio in a Gale crater mudstone from 3 billion years ago. On page 415, Webster et al. (2) report on the latest chapter in the muddy matter of methane on Mars. What links them is that both were made using the tunable laser spectrometer (TLS), part of the SAM (Sample Analysis at Mars) package on the rover.
