This week a report from America on how injured dogs are being saved with the help of artificial blood in a technique that could pave the way to a breakthrough in treating humans in need of transfusions. Artificial blood could mean the end of donor shortages and problems with matching rare types, along with the elimination of blood-borne HIV. Also, how viewers can help track what could be the biggest meteor shower for more than 30 years as comet Temple-Tuttle passes the Earth next month.
Presented by Peter Snow and Philippa Forrester, with Jez Nelson, Craig Doyle and Anya Sitaram.
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