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This is because, in just 100,000,000 years of time, not enough parent will have decayed for daughter concentrations to be reliably measured.
We had a decent first date, the chemistry wasn’t electric, but it was there.
Can you help with an explanation of what is being said when this description is used.
But, sir, I never told you I had any weight loss goals!
Kelvin argued that this was physically impossible (the concept is akin to a perpetual motion machine).
For example, isotopes with very long half lives are no good for dating rocks younger than about 100 million years.