Earth

The planet Earth is the homeworld of the Human race, initially the world was barren but the world was seeded by the Keepers for the purpose of harvesting the life for food or whatever purpose it desired.

Entertainment
Entertainment is an important aspect of human culture upon earth. Games, music, and radio are important

Music
Music plays an important role in earth's society and economy. There are a number of bands who have commercially released albums of songs. Jukeboxes are often used to play music. Also important to note is the vast array of small bands that do not have particular notoriety but still play music at more local establishments.

Radio
Humans use radio transmissions for entertainment purposes. One known talk radio entertainer was Art Bell who through various phone calls likely became the human (along with his listeners) most knowledgeable about the sphere without actually having been abducted.

Phonelines
It appears that some phone lines exist simply to satisfy innate sexual desires in humans, one of note was a Viking chatline.

Alcohol
There are many types of alcoholic beverages, hammered ale, ryan red, quinns Irish whiskey, royal pain are some specific examples. Several breweries for alcoholic beverages exist on the earth to provide these type of drinks, bowmen brewing co. (loc. Boston Massachusetts), keyhole brewery (loc. Madison Wisconsin).

Locations
There are many specific locations on earth, Jen's bar the Roadhouse, and Rhinehearts Private School are some examples. As well there was many places being monitored by the sphere because of their high population, or as the sphere phrases it a "concentrated protein populace."

Vehicles
School buses, trucks, planes, and jeeps.