Long before he was known as the Oracle of Omaha, Warren Buffett demonstrated the prescience that would eventually make him famous.

Read: Buffett sells Washington Post for $53 million

In an interview with Fortune, Buffett reveals how he was able to spot brewing troubles with pension plans a decade before everyone else, and the investment strategy that would help the Washington Post enjoy a pension surplus that today sits at $1 billion.

The revelations come in a 1975 letter he sent Katharine Graham, the paper’s then chairman and CEO.

Read more here.

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