Tag Archives: why

Contrary to common folklore, causal relationships can be distinguished from spurious covariations using inductive reasoning. Judea Pearl, Causality

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You know what’s surprising? Rotations are linear transformations. I guess lo conocí but no entendí. Like, I could write you the matrix formula for a rotation by θ degrees: But why is that linear? Lines are straight and circles bend. When you rotate something … Continue reading

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Kurt Gödel’s beliefs

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Question: what is the opposite of belief? Not disbelief. Too final, certain, closed. Itself a kind of belief. Doubt. Salman Rushdie, The Satanic Verses

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Do numbers exist?

When I was a math teacher some curious students (Fez and Andrew) asked, “Does i, √−1, exist? Does infinity ∞ exist?” I told this story. You explain to me what 4 is by pointing to four rocks on the ground, … Continue reading

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The Elements

Not talking about camping outside. I mean the elements as in the periodic table of the elements. How did they come to be? Why are there more of some and less of others? Why does 29 protons conduct electricity 10 … Continue reading

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Interstellar Dust

According to the movie Sunshine, most dust inside a house is old human skin. What is “dust” in outer space made out of?

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