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1. Postage Stamps
Other essential items of equipment are a magnifying glass, a perforation gauge, and a watermark detector. More than any other hobby, perhaps, stamp collecting leads you into a new and very wide world.
http://www.fun-home-projects.com/collecting/​postage_stamps.html

2. Smoke Detectors
A controversy rages over which type is the best fire detector. Radiation has always been the major bone of contention between the two factions.
http://www.fun-home-projects.com/home_ownership/​safety_and_special_interest/​smoke_detectors.html

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