December 14: Day of the Martyred Intellectuals in Bangladesh (1971); Monkey Day
Max Planck
- 835 – In the Sweet Dew Incident, Emperor Wenzong of the Tang dynasty conspired to kill the powerful eunuchs of the Tang court, but the plot was foiled.
- 1836 – The Toledo War, the mostly bloodless boundary dispute between Ohio and the adjoining Territory of Michigan, unofficially ended with a resolution passed by the controversial "Frostbitten Convention".
- 1900 – German physicist Max Planck (pictured) presented a theoretical derivation of his black-body radiation law, suggesting that electromagnetic energy could only be emitted in quantized form.
- 1962 – NASA's Mariner 2 became the world's first spacecraft to successfully conduct a planetary encounter when it flew by Venus.
- 2012 – A 20-year-old gunman shot twenty children and six adult staff members in a mass murder at Sandy Hook Elementary School in Newtown, Connecticut, US.
- More anniversaries:
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