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Moving pavements or 'skywalks' that protect from both weather and pollution are being developed in Bejing. An idealistic design for future living, or simply a way the rich can avoid mixing with the poorer people on the streets below?

Also on the programme: A look at the controversial baby hatch being tried out in Japanese hospital - but it is encouraging parents to abandon their infants? Plus, how the internet is helping bring parents together whose children share rare genetic disorders.