Scientists mail freeze-dried mouse sperm on a postcard (Science Daily): Researchers in Japan have developed a way to freeze dry sperm on a plastic sheet in weighing paper so that samples can withstand being mailed via postcard. This method allows for mouse sperm to be transported easily, inexpensively, and without the risk of glass cases breaking. Sperm-on-a-Postcard Breakthrough Opens Door to Massive ‘Sperm Books’ (Vice): One of the scientists even sent a festive “Happy New Year” card (image) to a colleague, with mouse sperm as an extra token of good luck. “In addition, since New Year’s greeting cards are used to write one’s hopes for the next year, we conducted the New Year’s greeting card mailing experiment in the hope that it would be a good year, i.e., that we would be able to successfully mail sperm and publish a paper,”
Study: Mailing viable mouse freeze-dried spermatozoa on postcards (Cell.com)