Michael Raiford wrote:

> He also filled a huge rubber balloon with a 2:1 ratio of pure hydrogen 
> and oxygen. Then took a flame to it. People on the other side of the 
> school campus heard the resulting bang.

Oh, and there was also the day we destroyed who knows how many pennies 
... I took the opportunity to "pour" the resulting brown gas (Nitrogen 
dioxide, I think?) from one container to another.

Judging from the Wikipedia article, a fume hood would have been a wise 
thing to use while doing this. :/

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