Unique Design Wood Supercar Apparently there's some worthwhile science in those Soap Box Derby cars we had to make in the Cub Scouts after all. North Carolina-based Joe Harmon Design has created "the world's first wooden supercar," which can reportedly reach speeds of 240 miles per hour.Cool Design Wood Supercar in Beside The 15-foot-long "Splinter" has a 4.6-liter V8 engine and is made from