The lateen rig

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A misunderstood sail

We consider a number of mistakes connected with a particular piece of old technology.

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People are different

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Visual photometry

Human eyes are not the same as electronic detectors.

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The limits of knowledge

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Necessary learning

Nowadays, one needs to learn software in order to learn software.

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The decorative clock

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Hands fixed

We ponder our relationship with time, or at least with timekeepers.

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Free advice

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And worth every penny

Our tutor looks ahead to losing some of his students.

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Eclipse planning

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Choosing one’s data

We contemplate activity during a very short time span.

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At long intervals

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Building on the floodplain

The most dangerous things are those that don’t come often enough.

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Teaching fractions

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Elementary does not mean easy

Our tutor confronts a challenge.

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Teaching old things

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The uses of the obsolete

Something that’s no longer used can still be illuminating.

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The theoretical piston

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A useful idea

We ask a chicken-and-egg question about a textbook staple.

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