We are buying 50 shares of Corning at roughly $78 each. Following Thursday's trade, Jim Cramer's Charitable Trust will own 650 shares of GLW, increasing its weighting to 1.4% from 1.3%. We're making one small buy into Thursday's market selloff. It wasn't always a rough day. Stocks got off to a strong start in response to Nvidia 's much better-than-expected quarter and outlook. All 11 sectors were positive early in the session. But stocks slid as the day went on, led lower by companies tied to data-center spending. There may be one silver lining to the decline — finally, the market might be oversold, according to the S & P Short Range Oscillator . The Oscillator closed Wednesday at minus 2.77%, more than halfway to the threshold needed to officially signal oversold. We suspect Thursday's re

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