More from Helen Pilcher
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Earth
The great white lie: What snowflakes really look like
Features
Women at work
Careers
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Written in blood: Your life history in just one drop
Features
Environment
The third factor: Beyond nature and nurture
Features
Humans
How flower power paved the way for our evolution
Features
Humans
Clone alone: Who needs sex?
Features
91色情片
Designer glasses correct red-green colour blindness
News
Life
Genes from nowhere: Orphans with a surprising story
Features
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The science of voodoo: When mind attacks body
Features
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As good as new: Scarless healing
Features
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Cancer: The traitors within
Features
Life
Reproduction revolution: The egg and sperm race
Features