the battery is running out, I'm going to turn it off.
But look at that.
It's almost all gone!
It's all gone!
[MUSIC]
>> Find it within a couple nights of having the project assigned.
[INAUDIBLE] This is supposed
to represent the 1792 era machine from the French Revolution.
We added a couple things like these suppors for
stability and these rings [INAUDIBLE].
Add those features until 1872, right?
>> Yeah.
>> The chemistry behind gunpowder is really simple.
You have charcoal which is what burns during the reaction and
creates most of the gasses and then you have potassium nitrate which
supplies the oxygen because by itself, carbon does not burn.
But to get those two to burn, you need a really high temperature to start it.
The sulfur which is flammable by itself
is added to the mixture to greatly reduce the ignition temperature.
>> Her head's in the biology room, and
then put all the blood splatter [INAUDIBLE]
analysis of blood spatter trajectory and probability.
[NOISE] >> That can be recycled,
these bottles are recyclables.
>> Okay.