Alan Rock's Trivia!

Questions:

1)  What is a craftsman who works with stone called?

2)  In dental terms, what does an amalgam refer to?

3)  Which four gemstones belong to the "precious" category?

4)  Astigmatism is a condition that affects which of the senses?

Answers:

1)  stone mason

2)  The dentist creates an alloy of mercury (50%), silver (22 - 32%), tin (14%) and other trace metals to be used for fillings. That alloy is referred to as "amalgam." There is some controversy over the use of mercury in the amalgam due to its toxicity and harm to the environment and its use is being phased out in many places.  Mercury use has been discontinued in Scandinavian countries since 2008.

3)  diamonds, emeralds, rubies and sapphires

4)  sight