Manage your subscriptions online. Find direct links for mailing address changes and publisher 1-800 numbers for magazine subscriber services. 1  A.  B.
Krypton is used in different forms for many applications in the medical industry. Krypton lasers are commonly employed for laser eye surgery. The laser is used to help prevent blood clotting in the eye as surgery is performed.
In Post Crisis continuity, Kryptonite only affects Kryptonians that originate from the same reality. Superman once visited a Pocket Universe wherein he discovered that three Kryptonian conquerors had devastated the Earth, ultimately conquering it. Superman used gold Kryptonite to remove their powers.