NASA Shuttle Launch Halts of Cloudy Weather
The launching of the space shuttle Endeavour was postponed a day because of thick clouds that moved in during the last few hours of the countdown. Forecasters had predicted an…
Pyrimidine
Pyrimidine is a ring-shaped molecule made up of carbon and nitrogen and is the basic structure for uracil, part of a genetic code found in ribonucleic acid (RNA). RNA is…