it depends how big the baseball is
No it was not a rule in 1956. Rule 4.03 became a rule years later when Keith Hernandez revolutionized the game of baseball, Fact !
The Clean Air Mercury Rule (CAMR), issued on March 15, 2005 under George W. Bush, was the first time the EPA required coal-fired power plants to reduce their mercury emissions, through a cap and trade approach.
Mercury is a rocky planet, unless you mean the element mercury which is a metal.
The mean concentration of mercury in the litosphere is 0,05 ppm.
What does the code P0190 mean on your 200 Mercury Mistique?
If you mean Freddy Mercury, then yes.
what does the phrase rule of thumb mean
It means that mercury is denser than iron.
there is none in the MLB ... there is a MERCIE RULE in little league ...
Indium-Mercury
Indium-Mercury