Why are certain heavy metals okay to eat? (video)

Heavy metals have a reputation for being dangerous, but some are essential nutrients that you can't live without. In this week's episode of Reactions, we explore why:

Developing the next generation of artificial vision aids

A new technology solution which will provide low-power systems for use in bionic eyes, has been jointly developed by academics from the Harbin Institute of Technology in China and Northumbria University.

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