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How infertility treatment has left sperm science behind

LONDON: They can make test-tube babies, grow human eggs in a lab and reproduce mice from frozen testicle tissue, but when it comes to knowing how a man’s sperm can swim to, find and fertilize an egg, scientists are still floundering. Enormous advances in treating infertility in recent decades have helped couples conceive longed-for offspring they previously would not have had. Yet this progress has also been a work-around for a major part of the problem: Sperm counts are falling drastically worldwide - and have been…