Uploaded June 2026 | Updated September 2026, 1 week ago

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Elf's Note: It's difficult to direct hot air balloons to specific points, and trains can carry more people at once.

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This clip is from QI Series V, Episode 7, 'Visionaries' with Sandi Toksvig, Alan Davies, Cally Beaton, Nish Kumar and Laura Smyth.