zephyrsolutions.com

9wvrm TIL that the US' control of the Helium supply during the war, caused the Hindenburg to use Hydrogen (which is much more combustible) instead and indirectly contributed towards its demise.
E1rdx TIL that the first animal balloons were made by Aztecs around year 1300, using real animal intestines; stomachs and bladders were also used. The intestines would be cleaned, sealed, filled with air and twisted to make dog and donkey shapes. These balloons were used as a sacrifice for gods.