Lamoreaux and Torgerson analyzed data from the Oklo natural nuclear fission reactor in 2004, and concluded that has changed in the past 2 billion years by 45 parts per billion. They claimed that this finding was "probably accurate to within 20%". Accuracy is dependent on estimates of impurities and temperature in the natural reactor. These conclusions have yet to be verified.
Lamoreaux and Torgerson analyzed data from the Oklo natural nuclear fission reactor in 2004, and concluded t.hat has changed in the past 2 billion years by 45 parts per billion. They claimed that this finding was "probably accurate to within 20%" Accuracy is dependent on estimates of impurities and temperature in the natural reactor. These conclusions have yet to be verified.