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National Geographic News has an interview with Tim Samaras — an engineer, a scientist who studies severe storm systems, and a tornado chaser. Not all chasers are professionals like this. For many people, it's a hobby often motivated by a desire to help keep other people safe. Personally, I see a lot of similarities between hobbyist tornado chasers and the HAM radio folks — in fact, there's a lot of overlap between the two communities. And, as Samaras explains, if you want to get involved, there's training you really ought to do first.
Useless machines are home-built devices that turn themselves off as soon as you turn them on — and that's it. That's all the they do. The more elaborate and gimmicky the method by which they accomplish this job, the better. As a hobby, useless machines have been around since the 1950s, but Abigail Pesta of the Wall Street Journal says they're making a comeback.