Scientists in Maryland in the United States are exploring what a lab-grown retina can tell us about how we can see millions of colours. Joining Jonathan to explain more about the research is Robert J. Johnston Jr. Associate Professor in the Department of Biology at Johns Hopkins University. Also joining Jonathan for this week's Newsround is Dr. Susan Kelleher, School of Chemical Sciences, DCU & Dr Fergus McAuliffe, Communications and Engagement Manager, iCRAG.

How does the human eye see so many colours?

Jonathan responds to your texts and tweets, is joined in studio for all the latest science stories for Newsround and speaks to one of our two guests featured on the show.

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How does the human eye see so many colours?

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