Title: Copper.
Question: How much of mined copper is used for cables and electrical wiring?

Title: Modern history.
Question: How did the Nazis conjure up anti-Semitic feelings in civilians?

Title: Humanism.
Question: How were humanist able to identify the development of humanist thought?

Title: Hard rock.
Question:
What was the hit off Steppenwolf's self-titled debut lp?