The 41-year-old agreed to show Fred around the European Space Agency's training facility because he was inspired to study science by the presenter's ITV programme 'How' as a child.
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A young Scout from Kent has collapsed and died while attending a jamboree in Finland.
Train services through Gatwick Airport face delays and disruption after a track fire closed half of the lines at the station.
Network Rail has reopened two of the four lines but two will remain closed for the rest of the day.