On Oct. 12, the 1,600 lumen bulbs will launch at a slightly higher price point of $19.99 for a single bulb, $39.99 for a white ambiance bulb, and $59.99 for the white and color ambiance bulb.

THE accompanying diagram (Fig. 1) suggests a striking example of wave motion in the vertical temperature gradient at St. Hubert Airport, near Montreal, during a large inversion of early morning of ...

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