Slow, slow, quick-quick, slow

Scientists in Israel, the USA and Japan have recalibrated rock-dating clocks due to a previous erroneous estimate of the half-life of samarium-146 (146Sm). The solar system is now thought to have been formed much quicker – although it is still reckoned to be over 4.5 billion years old.
http://www.huji.ac.il/cgi-bin/dovrut/dovrut_search_eng.pl?mesge133587435505872560

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