Meteorite discovery challenges long-held theories on Earth's missing elements
Understanding where Earth's essential elements came from—and why some are missing—has long puzzled scientists. Now, a new ...
Why are rubies red and emeralds green? Their colors come from the same metal in their atomic structure
The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...
Mental Floss24d
Can You Put the First 25 Elements of the Periodic Table in Order?
The periodic table of elements (often known simply as the periodic table) has been helping scientists with their work for a little over 150 years. The handy visual reference guide organizes known ...