I saw something like this on Facebook and decided to check it with Wolfram Alpha and Wikipedia. These are I believe correct as of today.
A billion seconds ago it was June 7, 1980.
A billion minutes ago was Oct 19, 110AD.
A billion hours ago was 114,155 years ago, the Pleistoncene, the middle stone age.
A billion days ago was 2.74 million years, the Pliocene, there were hominids but not Homo anything, we have found stone tools that are 2.6 million years old.
US Federal Government expenditures are $3.712 trillion/year which is $423.7 billion/hour or $1 billion in 2.36 hours.
US GDP generates $1 billion in 36 minutes.
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