Gallium Anyone. Interesting video
 

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https://strategicmetalsinvest.com/gallium-prices/#:~:text=The%20current%20price%20of%20Gallium%20is %20%24787.40%20per%20kg.&text=For%20bulk%20purchas es%2C%20whether%20investment,us%20directly%20for%2 0a%20quotation.

Thanks Rusty...so now I know it's a critical element in chip making.

gallium is used in semiconductor manufacturing.

Ga is also a component of most of the "mercury" thermometers. Gallinstan, an alloy/mix mostly of Ga-In-Sn, is still a liquid at very low temperatures.

Gallium, like aluminum, is the element used to enable and stabilize the more ductile and machinable phase of plutonium (delta-Pu) - that's important if one wants to do "things"

Gallium melts in your mouth but not in your hand (not precisely true, but almost and it's kind of a catchy phrase).

IIRC, gallium has the lowest vapor pressure over the liquid and the largest span of its fusion and boiling temperatures at normal pressures. Like the Na-K liquids, Ga is probably a good candidate for a cooling liquid in future (and past, at least on paper) fission reactors.

It's also pretty much nontoxic, so kids can still do what we all did with mercury way before there were rules. Leaves a grey stain on you hands though...