1. Aluminum is the most abundant metal on Earth
2. Gold is the only metal that can be recycled indefinitely and still be useful
3. Nickel is the most common metal in the Earth's crust
4. Copper is found in everything from electronics to plumbing to clothes to food cans, but there's no known way to extract it from its ores without using an incredibly toxic process called sulfidation that produces hydrogen gas, which can then be used as an energy source
5. Zinc is one of the most abundant elements in the universe, but it exists as a solid at room temperature (and even colder).
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