<p class="p1">Heisenberg's Uncertainty Principle, US Marines raise the flag on Iwo Jima, the first mass inoculation of children with the Polio Vaccine, and the start of the Persian Gulf ground war…all On This Day!</p>

Heisenberg's Uncertainty Principle, US Marines raise the flag on Iwo Jima, the first mass inoculation of children with the Polio Vaccine, and the start of the Persian Gulf ground war…all On This Day!

<p>Heisenberg's Uncertainty Principle, US Marines raise the flag on Iwo Jima, the first mass inoculation of children with the Polio Vaccine, and the start of the Persian Gulf ground war…all On This Day!</p>

February 23rd

A daily time capsule of stories of the significant, intriguing or just plain forgotten events of history that all occurred on this day.

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February 23rd

February 23rd