Actually I've controlled the wind (in one large area, not everywhere) a few times. I did it by clenching my fists and thinking about wind ( I was clenching my fists because I was angry, so the anger probably contributed to the thought and the process).
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Sure you can. You can use magnetism on metals, temperatures to change form, force to move, electrical current can cause combustion, combinations can cause reactions. If you mean can you manipulate them then of course you can you just need to use outside forces on the element. If you mean like in the Avatar cartoon series then no you can't.
It is possible to use control group in a sentence as long as it does make sense.
Without controls it is not possible to make a hypothesis
I hope temp inside the bulb can be control by varying the input voltage and monitoring it be Infra red thermometer. But it may possible that illumination of bulb get affected.
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NoCertainly - with the right chemical reactions. To separate the elements in a compound, you need appropriate chemical reactions to split the bonds of the molecules.