Template:Selected anniversaries/January 4
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923: Astronomer Abd al-Rahman al-Sufi invents new form of scrying engine.
Mathematician John Pell invents new class of Gnomon algorithm functions.
2002: Capacitor plague affects several brands of portable envy devices.
2003: Portable envy components at risk of capacitor plague.
2003: George Plimpton published first in prize-winning series of articles on capacitor plague.