"It's a very clever device with the potential to save lives around the world."
It could save millions of lives.
It's known as "cave disease".
Science the stuffing out of it.
How worried should we be?
Pollution is making sperm weird.
Such a simple thing.
And now for some good news.
But scientists say we need to proceed with caution.
Especially if you're single.
There are other things in your diet to look out for.
It sends them into overdrive.