Health

The truth about testicles: are we facing spermageddon?

Meet the man who wants to change all that “I think you can tell it’s for a lay audience,” says Michael Carroll, holding up his book, Your Nuts, its cover illustrated with two walnuts in a string bag.

✦ Extractive summary — built from the sources' own reporting•From 1 source•1 min read•Updated November 1, 2026, 2:00 PM UTC
Key points
  • This is not a drill, says Carroll, a biologist and reproductive scientist at Manchester Metropolitan University.
  • Or is this an unchosen fertility cliff edge, created by forever chemicals and our lifestyles?
  • Are people deciding not to have kids because of climate anxiety and economic precarity?

When it comes to fertility, testosterone and reproductive fitness, manosphere misinformation is rife - which can lead to a lot of heartache.

“Spermaggedon” is a chunky piece of this puzzle, part of a wider debate about whether and why we’re heading for species-icide.

Additional details
  • The book has arrived in tandem with worldwide concerns about falling birth rates.

How this summary was made: extractive summary — built from the sources' own reporting. It is drawn only from the reporting of the sources listed below — read the originals for full detail. How we summarize →

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