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A 13th Century depiction of a "leper house" (Credit: Getty Images)
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Why is leprosy still with us?

By Kamala Thiagarajan

Tokyo is the world's most populous city, with 37 million people, 60,000 restaurants and 167 skyscapers (Credit: Alamy)
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Is the world overpopulated?

By Zaria Gorvett
(Credit: Getty Images)
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Unpicking the mysteries of recycling

By William Park
The science of hypnosis has a long and at times eccentric history, but today it is emerging as a powerful therapeutic tool (Credit: Emmanuel Lafont/BBC)
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The truth about hypnosis

By Martha Henriques
A woman posing with her cloned puppy (Credit: Alamy)
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The people cloning their pets

By David Cox
A cloudy sky over Antarctica (Credit: Getty Images)
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What happened to the ozone hole?

By Kira Walker
Samples of dairy-free cheese (Credit: Getty Images)
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How vegan cheese is made without milk

By Jessica Brown