March 17, 1950 — The creation of Californium is announced

One of the elements of the actinide group, Californium was first synthesized on approximately February 9, 1950 by researchers at the University of California. After checking and replicating the initial experiment, its discovery was announced a month later, and the element named for the university (and state) where it had been created.

Unusually for a synthetic element, it was later discovered in naturally occurring forms, albeit as a result of extremely rare phenomena. Californium also has practical uses, notably in initiating nuclear reactions and in the creation of higher elements – ununoctium (element 118) was synthesized by bombarding californium-249 atoms with calcium-48 ions

A very small disc of silvery metal, magnified to show its metallic texture
By United States Department of Energy (see File:Einsteinium.jpg) – “Californium” in (2006) THE CHEMISTRY OF THE ACTINIDE AND TRANSACTINIDE ELEMENTS, III (3rd ed.), Springer, pp. 1,518 DOI: 10.1007/1-4020-3598-5_11., Public Domain, Link

As mentioned in:

The Fez — The Dead Milkmen

February 3, 1959 — Ritchie Valens, Buddy Holly and the Big Bopper die in a plane crash

The facts, as generally agreed upon, are these:

At appoximately 1AM on February 3, 1959, Holly, Valens and Richardson (‘the Big Bopper’) boarded a plane in Clear Lake, Iowa, intending to fly to their next concert, in Moorhead, Minnesota. The three, flown by pilot Roger Peterson, were killed a short time later when their plane crashed.

The major cause of the crash appears to have been a combination of poor weather conditions and pilot error. Peterson was not qualified for nighttime flights, and it also appears that he may have been given incorrect information regarding the weather conditions on that fateful night.