Chilly Weather

Tonight in Palo Alto I saw a middle-aged professorial gentleman wearing this typical California outfit:
Birkenstock sandals
ankle socks
khaki Bermuda shorts
heavy sheepskin jacket.

It was dark, and the temperature had dropped to all of 65.

As a rule, Californians put on a coat when the temperature drops below 72. However, they continue wearing shorts and sandals even when the thermometer is in the 50s. Don't they have nerves in their knees?

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