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(Not sure if it was the first time or even the beginning of time? Reionization marks the point at which the hydrogen in the Universe became ionized.

)Time Line of the Universe - Chronology of the Universe (wiki) Shape of the Universe (wiki) - Photo (image) Big Bang - Matter (conservation of mass) - Universe was denser and smoother in the beginning. Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.

Uranium measurements were by delayed-neutron activation analysis.

Helium measurements were by isotopic dilution in an all-metal system characterized by very low argon and helium blanks.

Nevertheless in our suite of young, chemically similar lavas the correlation between the KAr age and the helium content is good enough to make the helium measurement worthwhile as a check on a possibly anomalous argon age, especially in a system where the additional labor required to make the helium is minimal.

(1.5 Billion Years since the Birth of Earth) - 2.4 billion years ago, oxygen in the atmosphere suddenly increased by about 10,000 times in just 200 million years.

Ocean organisms and primitive animals start to evolve.

For 19 of the samples “preferred” KAr ages were also obtained.

None of the rocks are concordant in these two ages; all have lost helium.

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