Blood boys. Cryogenic freezing. Living by the algorithm. Silicon Valley is known for a culture of health optimization, but some recent biohacking ventures are becoming more extreme–aimed not just at longevity, but at beating death altogether. This week, we talk about the Silicon Valley moguls obsessed with living forever and the radical measures they're taking to do so. Write to us at [email protected]. You can follow Michael Calore on Mastodon at @snackfight, Lauren Goode on Threads and @laurengoode, and Zoë Schiffer on Threads @reporterzoe.