Nuclear transfer research encompasses some of the most compelling biological and ethical puzzles of our time. In an online publishing experiment, we asked you, The Scientist readers, to help us create the article.

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In the black gloop of down-beat news on global warming and Iraq, we sometimes forget that, in at least one respect, we are living through a shimmering moment of progress that should fill us with awe.

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Scientists say they have successfully made immature sperm cells from human bone marrow samples. If these can be grown into fully developed sperm, which the researchers hope to do within five years, they may be useful in fertility treatments.

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Scientists working at a British laboratory have achieved one of the most controversial breakthroughs ever made in the field of stem cell science by taking cells from dead embryos and turning them into living tissue.

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