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Valve logo origins: who is "the bald guy?" - PC Gamer
Mr. Valve - Half-Life Wiki
Occipital Neuralgia: Symptoms, Causes and Treatments - WebMD
Headache in Back of the Head: Causes and Treatments - Verywell …
The guy in the Valve splash screen : r/gaming - Reddit
Pain in the back of the head: 5 causes and their treatments
Vascular Headache: Symptoms, Treatment, and More - Verywell …
Causes of a throbbing headache at the back of the head - Medical News Today
Headache Location: Meaning, Causes, and Treatment - Verywell …
Why Does the Back of My Head Hurt? - WebMD