The walls of the boys’ classroom are painted blue, the light bulbs emit a cool white light and the thermostat is set to 69 degrees. In the girls’ room, by contrast, the walls are yellow, the light bulbs emit a warm yellow light and the temperature is kept six degrees warmer, as per the instructions of Leonard Sax, a family physician turned author and advocate who this May will quit his medical practice to devote himself full time to promoting single-sex public education.
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