"In a laboratory in Montana, Jason Forthofer lights one of the most unusual fires you'll ever see.
A fiery vortex more than three metres high spins inside a narrow human-sized glass tube, swirling like water down a drain.
Using only alcohol and air, Forthofer has created a Lilliputian version of one of nature's most terrifying and least understood phenomena: a fire whirl often referred to as a fire tornado or 'firenado.' "