Free About 1 hr0 learners Rev. 2026-10-28 0

In 2015 a team at Delft spent about 220 hours collecting just 245 measurements on two electrons in labs more than a kilometer apart. Those few numbers helped close an argument that Albert Einstein opened in 1935, when he insisted that particles must carry their answers with them and that nothing done in one place could reach out and change another. Nature, it turns out, refuses to fit both of those reasonable ideas at once.

You will follow the debate from Einstein and Bohr to John Bell, the CERN physicist who turned a philosophical quarrel into a question a laboratory could answer, and you will see his reasoning laid out with a simple game of colored lamps, no equations needed. Along the way you will learn why entangled particles still cannot send a message, what quantum teleportation really moves, and why the everyday world hides all of this so well. The next time a headline promises instant communication through entanglement, you will know exactly which question to ask.

Levels

  1. 1 1. Two Particles, One State 5-question quiz
  2. 2 2. Einstein's Challenge: The EPR Argument 5-question quiz
  3. 3 3. Hidden Variables and Locality 5-question quiz
  4. 4 4. Bell's Theorem Without the Math 5-question quiz
  5. 5 5. Putting Bell to the Test 5-question quiz
  6. 6 6. Why Entanglement Cannot Send Messages 5-question quiz
  7. 7 7. Teleportation and Entanglement Swapping 5-question quiz
  8. 8 8. Entanglement in Nature and Decoherence 5-question quiz

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