TBT: We kids had a source for dry ice for Halloween as it was part of our Dad's lab supplies. Here is Doc Sherman, the cryobiologist still playing with dry ice in his eighties.
Dad "earned international recognition while he was still a University of Iowa graduate student. A side project, arising out of his job at the medical school freeze-drying specimens for the Department of Urology, led to the first human conceptions using frozen and then thawed semen. In 1949, a group of British scientists reported its success in impregnating chickens using previously frozen semen treated with glycerol as a protectant. Sherman read the article and began his own experiments."
TBC...
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