There are more than a dozen incompatible yet fundamentally correct ways to measure time: Earth-centered?

FORBES: What It Takes To Find, Scrape And Sell Big Data

They compare the traditional market-cap-weighted indexers with ancient astronomers who attempted to perpetuate the Ptolemaic view of an Earth-centered universe.

FORBES: About John "Jack" Bogle

It's very much centered on Earth and revolves around your life as you know it--or can imagine it.

FORBES: Brave New World

This documentary by Marshall Curry is centered on former activists of the Earth Liberation Front, an anti-logging group that, in the late nineties, turned from peaceful protest to direct, unlawful action in the name of social change.

NEWYORKER: If a Tree Falls

To date, balloon-borne activities have centered around heliophysics and astrophysics that have not required precision-pointing, says Near-Earth Object (NEO) program officer Rob Landis at NASA headquarters.

FORBES: Budgets Nudge NASA Toward Balloon-Based Planetary Science: First Target? Comet ISON