The World Health Organisation sets a range of “normal” sperm count as from 15 to 250 million sperm per millilitre. (Men produce about 2 to 5 millilitres per ejaculation.) But it isn’t clear that more is better. Above a certain threshold 40 million per millilitre but the higher count does not mean a man is fertile. However, It takes around two months for stem cells in the testes to develop into new sperm, meaning that any single count is merely a snapshot of an evolving landscape. Among fears that an observed fall in sperm count may threaten the future of the human race. Do you think drop in sperm count threats humanity ?