Recap

Extra Dimensions & Global Warming

Professor of Theoretical Physics at Harvard University and author of Warped Passages, Lisa Randall talked about various topics in Physics, including the fascinating idea that there may be extra dimensions. In the first hour, Art was joined by physicist Noam Mohr for a discussion on strategies to address global warming.

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6.5 Billion People

Today at 7:16 p.m. Eastern Standard Time, the population of Earth is projected to reach 6.5 billion people. According to a March 2004 U.S. Census Bureau report, the world population hit 6 billion in June 1999. "This figure is over 3.5 times the size of the Earth's population at the beginning of the 20th century and roughly double its size in 1960," the report noted. Perhaps more amazing was the short time required to increase the planet's population from 5 to 6 billion -- just 12 years. Read more at LiveScience.com.