Touching history

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A human chain

We find that long ago may not be so long ago.

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Knowing your limits

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The art of the possible

We consider being more realistic in education.

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The sky is gone (II)

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A long history

The stars have been getting harder to see for a long time now.

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The sky is gone

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And it’s not coming back

Something you didn’t know you had is going away.

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The inefficient astronomer

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Learning and relearning

We ponder an example of wasted time in science.

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Unnatural mathematics

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Horizontal and vertical

Learning math involves unlearning many obvious things.

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The problem problem

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A pursuit curve

Answering the problems you get in class is less difficult than posing them in the first place.

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Tilting at windmills

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The vanishing knight

Where did Don Quixote go?

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A small tool

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One step beyond the eyes

We consider an anachronism.

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Beyond our expertise

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Biology

We confront a vast area of (our) ignorance.

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