September 13, 1900 (Thursday)
- Filipino resistance fighters under the command of Colonel Maxio Abad defeated a large American column in the Battle of Pulang Lupa, and captured Captain James Shields.
- Dr. Jesse Lazear allowed himself to be bitten by a mosquito at the Las Animas Hospital in Cuba, as he searched for a cure for yellow fever. Five days later, he began to feel ill, and he died on September 25. Dr. Lazear's tragic experiment proved that the disease was spread by mosquitoes, and that the prevention of yellow fever required the eradication of the insects.
- Wilbur Wright visited Kitty Hawk, North Carolina, for the first time, on the shantyboat Curlicue.
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