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Food for thoughtfor the curious, the learners, the seekers, the explorers.

Swap the scroll for something worth knowing. Learn the big ideas a good university would teach you, from philosophy to physics, explained one at a time in plain English. An Idea takes about ten minutes. A Book review gives you a whole book. A short quiz at the end shows you what stayed with you.

18 Ideas · 21 Books · 7 Essays · 159 quiz questions

Idea of the day

Why Is the Night Sky Dark? Olbers' Paradox, Explained

For four hundred years a dark night sky was one of the hardest puzzles in astronomy. You learn why that darkness is a real surprise, which simple fact about time explains it, and why the most common explanations fail. You also pick up a habit for testing claims: ask what you should already see if they were true.

Physics & Chemistry6 min read · 3 questions