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The Older You Get, The More Likely It Is You'll Have Mutated 'Selfish' Sperm Cells

It’s well established that older men are more likely to pass on a genetic disorder to their offspring, but we’re learning more about why this happens: As men age, their sperm mutates more frequently. This is bad news for men who want to have children later in life.

Cyborg Sperm Could Revolutionise Fertility Treatments

Some men produce sperm that are poor swimmers, a major cause of infertility. To help, researchers from Germany have developed motorised cyborg “spermbots” that can be guided directly to an egg.

Scientists Can Now Make Fake Sperm Swim 

What you’re seeing in this video is obviously a sperm cell, except it was made in a lab, not a testicle. It’s designed to show how passive elastic swimming can mimic, fairly well, the motions that allow sperm (or fish) to swim.

This Is Why A Mouse's Sperm Is Longer Than An Elephant's Sperm

A mouse’s sperm is much, much larger than an elephant’s sperm. A fruit fly produces the longest sperm known to science. Why do tiny animals make big swimmers, but large animals make small ones?

The Last-Ditch Fertilization Method For Infertile Men Just Got More Reliable

For the past 25 years, men whose sperm can’t manage the arduous swim across a Petri dish have had the option of injecting a single sperm cell directly into an egg. But that method still left some sterile men out in the cold.

Women Aren't The Only Ones With A 'Biological Clock' -- Men Lose Fertility As They Age, Too

Women know that menopause can put a “sell by” date on getting pregnant, but common wisdom says that men retain much of their fertility well into old age. That common wisdom is wrong.

Here's How Ejaculation Actually Works 

Ejaculation may feel like a glorious mess, as uncontrollable as an avalanche or a runaway train. In reality, it’s a tightly choreographed court dance: integrating three different branches of the nervous system, triggering cascades of contractions in smooth and striated muscles, all accompanied by the electrical storm of orgasm. Here’s how it works.

This Video Proves That Penguin Sex Can Get Kind Of Messy

Video: Two penguins at the Monterey Bay Aquarium decided to make baby penguins in front of their viewing window. In the process, they showed off a fascinating aspect of bird reproductive biology.

Watching These Sperm Cooperate Is Oddly Fascinating

Get your Sunday started right by watching how sperm sometimes form power-swimming blocks to get ahead. And learn why these particular sperm get together.

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