1

Gallium melts in room temperature.

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This is how gallium reacts with aluminium.

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A spoon made out of gallium and a cup of water

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Sulfur Hexafluoride is the opposite of helium--It's so heavy it allows solid objects to float.

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It would also make your voice sound much lower than it actually is.

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Hydrophobic (Water-Repelling) surfaces repel... water.

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Like this:

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...And like this:

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This is hydrophobic sand.

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You've probably seen how nitrogen triiodide works. It's basically explosive dirt.

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Very effective for resolving drug cartel situations

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Nitrogen triiodide detonation looks like this.

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This is sodium acetate (hot ice).

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Hot ice, scientifically known as sodium acetate, is a liquid that will turn solid at the slightest provocation. Touching it with your finger, bumping it too hard, or speaking a few angry words will cause it to spring from a clear, water-like state into solid ice-like crystals.

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Nitinol, an alloy of nickel and titanium

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It has the impressive ability to "remember" its original shape after you've gone and bent the crap out of it.

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