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Scientists in Cambridge have built a rocket-powered punt - using fuel made from cake.
It's the first of its kind and was launched on the River Cam this afternoon (Tuesday 21st July).
The cakes came from the famous Fitzbillies bakery which is said to be a favourite of Professor Stephen Hawking.
It worked by freezing the Chelsea buns with nitric oxide and using the sugar, fat and oxygen in them to create power.
The launch set off from Darwin College as part of an exhibition about Space at the Cambridge Science Centre.