Welcome to the Official Guide to No Safety in Numbers. A biological bomb has just been discovered in the air ducts of a busy suburban mall. At first nobody knows if it's even life threatening, but then the entire complex is quarantined, people start getting sick, supplies start running low, and there's no way out. This is the ultimate guide to the book that started the series!
Electromagnets are used in things that have moving parts, eg. CD players, heads on Hard drives, automatic doors in a grocery store, electric windows, motors etc., Some examp â¦ les include: You can slide the bolts of locks and latches, tap out telegraphic dots and dashes, open and close switches in distant electric circuits.
Electromagnetic radiation is the means for many of our interactions with the world: light. allows us to see; radio waves give us TV and radio; microwaves are used in radar commu-. nications; X-rays allow glimpses of our internal organs; and gamma rays let us eavesdrop. on exploding stars thousands of light-years away. Electromagnetic radiation is the messen-. ger, or the signal from sender to receiver.