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. But experts have warned the findings from the German study should be interpreted with caution at this very early stage. And proposed new laws would ban their
Missing out on sleep may cause the brain to stop producing new cells, a study has suggested. The work on rats, by a team from Princeton University found a lack of sleep affected the hippocampus, a brain region involved in forming memories. The research in Proceedings of the National Academy of Science showed a stress hormone causes the effect. A UK expert said it would be interesting to see if too
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