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From him and refuses to concede despite a lack of evidence. Now hes sacked his defense secretary, mark esper. And understanding the history of Human Evolution we find out what a team of researchers has learned after digging up a two million year old skull. Welcome to the programme. Leading scientists are cautiously welcoming news of a new vaccine against coronavirus thats proved more than 90 effective in early results. The vaccine, developed by pharma giant pfizer and its partner biontech has been tested on nearly a4,000 people in six countries, with no safety concerns being raised so far. Some experts though point out that the announcement was made on the basis of very early analysis, with the vaccine not yet formally approved. Our medical editor fergus walsh reports. This is a huge day for science, and perhaps the world. For the first time, a covid 19 vaccine has been shown to protect against the disease. Plenty of caution is needed, but the preliminary results of the Pfizer Biontech

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