January 22, 1900 (Monday)
- The Library of Congress officially opened its newspaper reading room, the largest in the world at that time.
- Henry Allen Hazen, the chief forecaster for the United States Weather Bureau (now the National Weather Service), was fatally injured when his bike collided with an African-American pedestrian at the corner of 16th and M streets in Washington. He died the following day from a skull fracture. Hazen was credited with inventing the sling psychrometer, an improved thermometer shelter, and detailed barometric tables
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