Clues - TimeOne

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The Problem of Perfection Image source:

The Problem of Perfection

The Spooky Action Problem Image source:

The Spooky Action Problem

The Problem of Small Numbers Image source:

The Problem of Small Numbers

The Lumps Problem Image source:

The Lumps Problem

The Problem with Inflation Image source:

The Problem with Inflation

The Troubles with Strings Image source:

The Troubles with Strings