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Cross section of infertile mouse testis showing previously frozen transplanted rat germ cells and sperm. Frozen testicular tissue still viable after two decades.

Rat testicle cells make sperm after being frozen for 23 years

10 May 2022

Pre-pubescent children who become infertile because of cancer treatment may be able to make sperm after reimplanting frozen testicular tissue, if animal research translates to humans
H1N1 1918 influenza virus

Deadly 1918 flu pandemic may be source of modern milder seasonal virus

10 May 2022

Viruses sequenced from century-old lung samples in German and Austrian museums have shed light on how flu can change over time

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