Janice didn’t inhale a balloon full of helium. That’s just her “normal ... What questions do you have about the human body? Let us know in the comments and thanks for watching.

So what happens to a helium balloon, flying freely inside your vehicle? Surely it too will be thrown backwards as you accelerate in the forwards direction? Well, as you may have already intuited ...

Helium was non-flammable and thus a safer option than hydrogen; however, it only had 92% of the lifting capacity of hydrogen, so a larger balloon was required to lift the men and their equipment.

Coroner Dunn warned: "These threats are heightened when inhaling pressurised helium from a cylinder/canister given the amount that can enter the body due to the pressurised gas." ...