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  1. Nitrogen

    4/4 The bringer of life and death on a massive scale, as well as an environmental headache.

  2. Bromine (Br)

    Bromine-based flame retardants are all over your home, but are they a health risk?

  3. Calcium (Ca)

    The great structural element - both in the natural world and in modern engineering

  4. Uranium (U)

    Nuclear power is carbon-free but leaves radioactive waste - a real dilemma for Greens