Randy Holmes-Farley
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Thanks for all the great ideas, folks!
Here's my favorite: carbon.
Aside from being critical for earthly life, and maybe most or all life anywhere, it's remarkable for the fact that it forms into many different solid forms with very different properties.
Diamond
Graphite
Amorphous carbon
Fullerenes such as Buckeyballs and Buckeytubes
It's radioactive form 14C is very useful for dating objects on earth and its stable 13C isotope is very useful for various analytical methods, such as NMR.
Here's my favorite: carbon.
Aside from being critical for earthly life, and maybe most or all life anywhere, it's remarkable for the fact that it forms into many different solid forms with very different properties.
Diamond
Graphite
Amorphous carbon
Fullerenes such as Buckeyballs and Buckeytubes
It's radioactive form 14C is very useful for dating objects on earth and its stable 13C isotope is very useful for various analytical methods, such as NMR.

