What naturally-occurring elements are the most worthless or not helpful for the creation and sustainence of life?

Lead is still used in god damn everything. Its unfortunate but it’s so cheap, and so useful, how could industry resist?. The res a good chance the pipes you have in your house and used by your city are lead, you shower pan likely had a lead sheet backing, lead is also use for tons of electrical connections. Even copper pipes are likely to be soldered together with lead. Lead is also used to heat treat steel parts, which is used in everything.

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