The experiment is over. Time to load the equipment back into the van. After a final trip to the PSI café, we set off for Horgen, a town on the shores of Lake Zürich. The Italians were in charge of loading the pumps but at the first few roundabouts there are creaks and clunks. So we end up in General Electric car park for half an hour resecuring everything. It’s a hot drive – the temperature is pushing 30 degrees so once in Horgen, we head straight for the Sportbad; a 50m open air pool with adjacent lake swimming area. We relax and swim in the pool. Daughter no 2 swims in the lake but I wuss out and make do with sitting semi emerged on the steps. Then we check into our B&B. We’ve been
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