Martian meteorites are like a great novel, spinning out the history of the Red Planet.
With each look, scientists read a new twist to the plot, and every now and then, they find find a whole new chapter. British scientists this week announced they had positively identified a rock found in the Sahara as the 13th known Martian meteorite. While the meteorite, dubbed Lucky 13, will certainly shed new insights, scientists are far from finished scrutinizing the first 12. The current issue of the journal Meteoritics and Planetary Science alone contains 19 papers on the Martian rocks. Most follow-up studies have weighed in against that claim, and this week s papers were no exception.