Dad giving away homemade backyard roller coaster A dad in San Diego, who also happens to be an engineer, has designed and built a one-of-a-kind toy for kids of all ages, a homemade roller coaster ...

My face is sliding backward! Many modern roller coasters begin with a quick launch – 0 to 120 mph in less than four seconds – rather than the ka-chunk, ka-chunk of a chain slowly towing a car ...