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.
Namenda blocks the NMDA receptor, which is normally a target of glutamate. Glutamate is a chemical messenger involved in storing, processing and retrieving information. Glutamate triggers the NMDA receptor, which normally protects the brain cells from an imbalance of chemicals and electrolytes like calcium.