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The Daily Matter | Sunday Science

Four-winged birds, mapping the mysteries of the mind, technology that diagnose Alzheimer's and more. This week on SCMP's science page.

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See those things that look like speed lines around the ankles of this Sapeornis bird fossil? They're a whole lot of extra feathers. Photo: AFP
See those things that look like speed lines around the ankles of this Sapeornis bird fossil? They're a whole lot of extra feathers. Photo: AFP

This Sunday:

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