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Hey, Vsauce! Michael here.
Gas. It's all around us in the air we breathe. It fills our lungs and provides us with the oxygen necessary for respiration, and thus...survival.
But not all gas is for survival. In a mid-20th century experiment known commonly as "The FInal Solution," a gas known as Zyklon B was used to exterminate millions of Jews, and to great effect....or...so we thought until recently. In fact, what scientists are discovering is that many of these accounts have been fabricated or otherwise embellished, and are thus untrue.
But what is...truth? Some would argue that it's what we see right in front of us, like how I can wave my hand in front of my face and say confidently "my hand is here." But there's another theory...