Physics Question:

Which of the following particles has not yet been observed but is generally theorized to exist:

1. mesons
2. gluons
3. fermionic hadrons
4. gravitons

Answer: D

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What large machine, which came on line in the summer of 2000 at the Department of Energys Brookhaven National Lab, is the world’s highest energy ion collider:	The fundamental forces of nature are most correctly given as: