 How did the Mercurians adjust to the heat?
Only the native waiters, the enigmatic, yellow-eyed Mercurians, seemed unaffected by the heat. Jaro Moynahan wiped the sweat from his forehead with a fine duraweb handkerchief. The Mercurians worship him. Jaro Moynahan refilled their empty glasses. "Ah," said Jaro Moynahan; "so that's the way it is." One moment the garden was glowing in light, the next the hot black night swooped down on the revelers, pressing against their eyes like dark wool. These yellow-eyed Mercurians could see as well in the dark as any alley-prowling cat. For centuries they had lived most their lives beneath ground to escape the terrible rays of the sun. Only at night did they emerge to work their fields and ply their trades.
 They mostly lived under the ground.
 Their yellow eyes filtered the sun’s rays.  They mostly lived under the ground.  Their skin kept them cool.  They would sweat to cool off.