The atmosphere is quite dusty, giving the Martian sky a light brown or orange-red color when seen from the surface; data from the Mars Exploration Rovers indicate that suspended dust particles of roughly 1.5 micrometres diameter.
Glutamate is a powerful excitatory neurotransmitter that is released by nerve cells in the brain. It is responsible for sending signals between nerve cells, and under normal conditions it plays an important role in learning and memory.
Glutamate is an amino acid, found in protein-containing foods. It is one of the most abundant and important components of proteins. Glutamate occurs naturally in cheese, milk, meat, fish, and many vegetables. Glutamate is also produced by the human body and is vital for metabolism and brain function.