explanation

Textbook writing

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Induction or deduction

We compare two approaches to teaching mathematics.

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Not quite constant

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Dealing with precession

We note some of the difficulties in writing historical fiction (among other things).

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Flower pictures

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Seasonal photography

A sign of spring raises a very basic question.

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Twelve quarters

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Where the wind blows

A poetic phrase has an unexpected scientific source.

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Colors of the stars

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Poetic and precise

How do you describe a color?

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The long hours

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Time of the season

Some hours used to be longer than others.  Really.

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Alphabetical order

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An historical mistake

We highlight an instance in which not knowing one’s history led to mistakes in astrophysics.

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The last hurrah of the silver plate

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Hunting oxymorons

We recall an example of cutting-edge research using obsolete means.

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Knobology

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Not intuitive

Some arbitrary details can be very important.

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Make a map

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Charts, surveys and catalogs

We notice the importance of what and where.

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