Every year, millions of people get together on the Fourth of July to watch the fireworks and gaze at the beautiful colors that light up the night sky. But behind the oohs and aahs, what does it ...

With the 4 th of July upon us, towns big and small across the US will once again engage in an almost never-ending round of pyrotechnic displays that will draw plenty of oohs and aahs. The largest, ...