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Uranium isotopes (238U/235U) are commonly utilised in marine carbonates to reconstruct the redox evolution of ancient oceans and the atmosphere. However, questions remain concerning U isotope fractionation during carbonate precipitation and/or early sedimentary diagenesis. Moreover, the stromatolitic nature of many Precambrian limestones and dolostones brings further questions about U isotope fractionation during stromatolite formation due to microbial activity. Thus, it is unclear whether stromatolites are reliable archives for the U isotope composition of seawater. Here we measure the 238U/2...

Do you think north korea would actually launch a nuclear attack against the united states? i mean -- >> no, no. and the reason they wouldn't do it is because we would know where it came from and we would retaliate immediately. the thing that people in washington are concerned about is not an airmailed nuke, but really a weapon that has been smuggled across the mexican border, brought in and assembled. that you know you can't necessarily trace who did it because although we know north korea's plutonium isotopes, we don't know their uranium isotopes and we're not going to retaliate unless we are...