Oct 15, 2026 · 25 min · 9 segments
Hold an ordinary rock in your hand, and you're holding something that, statistically, is probably older than every human civilisation combined, older than the dinosaurs, quite possibly older than…
Let's start at the beginning, or at least when people thought the planet was dramatically younger.
Yeah.
So before scientists developed the tools to actually read the geological clues locked in the rocks themselves, they had to rely on, well, the most comprehensive historical records they had.
Which were books.
Exactly.
Okay, let's unpack this because this starts with an Irish archbishop from the mid-1600s, right?
Yeah.
A guy named James Ussher.
Right.
Archbishop Ussher.
And he published a calculation in 1650 that placed the beginning of the world in the year 4004 BC, which by our modern understanding is incredibly recent.
And today, you know, it's very easy to look back and dismiss that number as primitive or even foolish.
Right.
It sounds totally unscientific to us.
But context is absolutely crucial here.
For the seventeenth century, Ussher's work was widely accepted as a serious, respectable scientific estimate.
Really?
Oh, absolutely.
He undertook this extraordinarily detailed piece of scholarly work.
He was working backward through biblical genealogies, the reigns of kings, and intersecting all of those with known dates from Persian and Roman history.
So he was doing actual math?
Yes.
He was applying rigorous logic to the most complete data set he believed he had.
Let's start at the beginning, or at least when people thought the planet was dramatically younger.
Yeah.
So before scientists developed the tools to actually read the geological clues locked in the rocks themselves, they had to rely on, well, the most comprehensive historical records they had.
Which were books.
Exactly.
Okay, let's unpack this because this starts with an Irish archbishop from the mid-1600s, right?
Yeah.
A guy named James Ussher.
Right.
Archbishop Ussher.
And he published a calculation in 1650 that placed the beginning of the world in the year 4004 BC, which by our modern understanding is incredibly recent.
And today, you know, it's very easy to look back and dismiss that number as primitive or even foolish.
Right.
It sounds totally unscientific to us.
But context is absolutely crucial here.
For the seventeenth century, Ussher's work was widely accepted as a serious, respectable scientific estimate.
Really?
Oh, absolutely.
He undertook this extraordinarily detailed piece of scholarly work.
He was working backward through biblical genealogies, the reigns of kings, and intersecting all of those with known dates from Persian and Roman history.
So he was doing actual math?
Yes.
He was applying rigorous logic to the most complete data set he believed he had.
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