Warning! Inhaling beryllium dust or fumes can be fatal. Beryllium is a confirmed human carcinogen. The critical effects of exposure to beryllium are lung cancer and berylliosis. The present ACGIH TLV ...

propagation of electro-magnetic waves along periodic circuits and filtering properties of such systems.

Has the site been hacked? Maybe it’s a prank? What if I told you that you’ve just memorized the first 10 elements of the periodic table. Much of your memory is stored in the form of associations.