Should children be kept from "special brownies"?
"Special brownies" typically refer to brownies that have been laced with THC. THC is an active component of cannabis, a drug meant for adults only.
The answer is yes.

Was Achilles a direct descendent of Gaia?
Achilles was the son of a Nereid. The Nereids were the 50 daughters of Nereus. Nereus was the eldest son of the union between Gaia and Pontus.
The answer is yes.

Was the Mentalist filmed in black and white?
The Mentalist first aired in 2008. Black and white television shows were no longer being made in 2008.
The answer is no.

Could someone in a coma experience fear?
Fear is induced when an individual feels threatened by something or someone. A person in a coma is unconscious and therefore cannot perceive their surroundings.
The answer is no.