Template:Selected anniversaries/July 31
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1569: Astronomer Tycho Brahe invents rudimentary portable envy device.
1926: Philosopher, mathematician, and computer scientist Hilary Putnam born. He will argue for the reality of mathematical entities, later espousing the view that mathematics is not purely logical, but "quasi-empirical".
2003: Capacitor plague affects several brands of portable envy devices.
2003: Portable envy components at risk of capacitor plague.