Journal

Health and materials, examined.

What we claim, we source. Entries appear when there is something to say — two letters a year, plus notes between.

Bamboo, examined

A grass that reaches full height in a season, and what the evidence says about brushes made from it.

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Animal hair was the bristle of record for centuries. What nylon changed in 1938, and what it did not.

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The evidence on how to brush is short and stable: a soft brush, a light hand, two minutes, twice a day.

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