A balloon released by a schoolboy in Derby has turned up 10 thousand miles away - in Australia.
Pupils and staff at Wyndham Primary Academy were thrilled when they got tags returned from balloons that had travelled overseas.
Six-year-old Joshua Blackaby received a letter from a girl in Sydney, telling him she'd found his balloon down under.
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Nine professional and amateur pilots will take off on a virtual trip of the world to raise money for Lincs & Notts Air Ambulance.
There will be long periods of sunshine and light winds.
It will be dry, sunny and warm.