Researchers have been studying a promising option for male birth control, and we've learned a bit more about how regeneration works in hydras!

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Sources:
Vasalgel
https://www.eurekalert.org/emb_releases/2017-02/bc-mcg020217.php
https://bacandrology.biomedcentral.com/articles/10.1186/s12610-016-0033-8
https://bacandrology.biomedcentral.com/articles/10.1186/s12610-017-0048-9
http://www.sciencedirect.com/science/article/pii/S0010782498001036
https://www.parsemusfoundation.org/projects/vasalgel/vasalgel-faqs/

Hydra
https://www.eurekalert.org/emb_releases/2017-02/cp-hhk020217.php
http://www.cell.com/cell-reports/fulltext/S2211-1247(17)30073-6

Images:
https://commons.wikimedia.org/wiki/File:Male_anatomy_en.svg
https://commons.wikimedia.org/wiki/File:Hydra-Foto.jpg