If you're the skeptical type, you might raise an eyebrow when you hear that a particular Viking ship was built in the year 819. How could anyone determine the age of such an aged object so precisely, ...

Tree-ring dating and radiocarbon research has established an absolute timeline for the archaeological, historical and environmental record in Mesopotamia from the early second millennium B.C.

Attribution researches the influence of climate change on local weather and impacts. We issues alerts in many instances when the Climate Shift Index identifies a notable extreme weather event around ...

Prior to Earth Day showing up on the April calendar, Arbor Day was, and still is, celebrated on the fourth Friday in April. Trees, especially oaks, played a role in our country’s history long before ...

The activity below allows you to build a tree-ring chronology. Each horizontal bar represents the tree-ring pattern for one tree. By looking for matches in the patterns, you should be able to build an ...