What makes one firework glow red and another blue? Different combinations of chemicals are incorporated to give Fourth of July fireworks their brilliant colors
What exactly gives fireworks their colors? According to Nathaniel Finney, senior lecturer in North Carolina State’s Department of Chemistry, fireworks get their brilliant colors from different metal salts heated to high temperatures.
Lithium and strontium salts emit red light.
Sodium salts are used to create yellow light.
Calcium salts are used for orange light.
Copper salts, despite the name, emit blue, not copper, light.
Barium salts glow with a green light.
Santa's wish: Marry me
A Massachusetts firefighter surprised his girlfriend this week by suggesting they dress as Santa and Mrs. Claus for his fire department's annual children's Christmas party, then popped a stunning marriage proposal in full attire.Continued ...
Twitter reacts to Time's Person of the Year
Time has announced its Person of the Year for 2013: Pope Francis. The announcement, seen live on the "Today" show Wednesday, generated immediate reaction on Twitter. Here is a sampling.Continued ...
VIDEO: Interpreter at Mandela memorial called a 'fake'
The head of the Deaf Federation of South Africa said the sign language interpreter on stage during Tuesday's memorial for Nelson Mandela was a fake.Continued ...
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