Business cards can be surprisingly insightful—especially if they bear the names of history’s most famous personalities.

Several fascinating name cards of the world’s most well-known people have surfaced on the internet—including contemporary tech legends and important historical figures.

From Mark Zuckerberg’s provocatively worded card to Houdini’s intriguing piece of triangular cardboard, these will make valuable additions to any business card collector’s stash.

You may want to keep every business card you receive from now on—because you never know which of the names printed on them will become famous in the future.

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