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You can\u2019t build up a picture of Covid-19\u2019s spread throughout the UK without testing those who might have it and those who might have already had it. Britain currently is only testing people who are hospitalised, some healthcare workers and a handful of exceptions. The upshot is that we don't have reliable numbers on how many people in the community have, or have had, Covid-19. Even self-reporting doesn\u2019t pick up those who carry the virus, but do not show any symptoms. \nProfessor Mike Bonsall is part of a team at Oxford University running a new project that seeks to change that. They want to estimate how common the coronavirus causing disease is in the UK, using a new diagnostic tool called nanopore sequencing. If you want to take part, have not had any symptoms and live in the Oxford area - https://covidstudy.zoo.ox.ac.uk/

You probably think you know your body like the back of your hand, but given that it\u2019s made up of an average of about 37 trillion cells, some sort of guide book might be helpful. This is what the Human Cell Atlas, an international project, is doing. By providing a map of human cell types, aims to help researchers fight diseases, from cancer to covid19. \nAlthough every cell in our bodies has the same genetic code \u2013 the same DNA; the differences between, for example, muscles cells, brain cells, and fat cells \u2013 come down to which bits of the DNA each cell uses - which genes are switched on and off. This gives cell types their different characteristics. The Atlas not only helps scientists understand the precise nature of each cell type but also how they interact with other cells in the body.

There are a lot of myths surrounding the source of the rose-necked parakeets in south east England. The introduction of these noisy green alien invaders have been attributed to Jimi Hendrix, George Michael and even Humphrey Bogart. But where did they really come from?

Presenter - Marnie Chesterton\nProducer - Fiona Roberts