Massachusetts was the first state to legalize gay marriage, in 2004.
Only half polled knew what "fracking" was, and only 1 in 5 knew that nitrogen makes up most of Earth's atmosphere.
Ammonium nitrate, a key ingredient in fertilizer, can be powerfully explosive under certain conditions.
One of the most active volcanoes on Earth, Hawaii's Kilauea has erupted continually for more than 30 years.
Huge stresses beneath the surface moved plates of the Earth's crust hundreds of feet horizontally and dozens of feet vertically.
A study by the Pew Research Center shows that the total number of Catholics in the world has tripled in the past century.
This tiny squirrel-sized creature would later evolve into a diversity of mammal species including humans.
The dangers in introducing icy frozen turkeys to a pot of searing hot fry oil. Just part of our wall to wall Thanksgiving coverage.
How Solar Eclipses Work: When the moon covers up the sun, skywatchers delight in the opportunity to see a rare spectacle.
Follow the path of hurricane Sandy as it casuses more than 150 deaths and billions of dollars in damages.
Hurricane Irene was a billion-dollar disaster, but it is dwarfed in terms of size by Hurricane Sandy.
If you took the ice in all of Earth's mountain glaciers, it would make a cube with 34-mile-long sides.