BORON [B] 5 10.811 u ± 0.007 u

5$ PER GRAM

You want a Boron, to avoid a moron.

You need boron in your life, not only is it 0.001% of Earth's crust. It's also used is many well-known cleaning agents, who doesnt want some of that? Boron is pretty, black and shiny. and hey, don't forget, it protects you from morons. ;)
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