source: [□=□] □
destination: [tag=□] □
spec: By 1953 , Detroit boasted the largest number of black-owned businesses in the nation . Our group at Johns Hopkins is using this approach to data analysis over a wide range of problems from astronomy to turbulence to wireless sensor networks collecting data from the environment . Sea turtles are threatened by beach development , light pollution , ocean dumping , incidental take in trawl and longline fisheries , disease ( especially fibropapillomas ) , and many other variables . Throughout the day there will be demonstrations of such things as telescope mirror making , light pollution and good outdoor lighting , and help in learning the constellations .