... tolerance¹

The concept was first mentioned in [McC88].

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... express.²

The non-linguistic background knowledge has been emphasized in connection with physical skills by Hubert Dreyfus and others [Dre92], but there is important non-linguistic knowledge also when the skill is purely symbolic. Even though a mathematician or a stock broker operates in a purely symbolic domain, he still cannot verbalize his full set of skills.

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...Drosophila³

Drosophilas are the fruit flies that have been used by geneticists to study inheritance since 1910. Their short generation times, large chromosomes and the ability to keep 1,000 of them in a bottle make them valuable, even though the Drosophilas of today are no better than those of 1910. The utility of suitable Drosophilas for scientific research in AI needs to be emphasized, because of a recent fad for demanding that all research promise a practical payoff on a three year schedule. They aren't getting their payoffs and are learning much less than a more scientific approach would get them.

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... problem.⁴

It was not mentioned before that the boat was a rowboat. Once oars are mentioned, it is a Gricean implicature that the boat is a rowboat. The philosopher Paul Grice [Gri89] studied what can be inferred from statements under the assumption that the person posing the problem is not trying to be misleading. That the boat is a rowboat follows, because the speaker should have said so if it wasn't.

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... form.⁵

``Pull, pull, my good boys'', said Starbuck.--Moby Dick, XLVIII

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