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Wolves Help Aspen Trees

September 2007 1:52

Wolves Help Aspen Trees Grow

Continental Deformation: Creating the Basin and Range

September 2007 8:11

Continental Deformation: Creating the Basin and Range

humanfootprint

September 2007 2:35

Human Footprint

How have humans altered Earth's land surface? See it via satellite.

New Fossils Extend Family Tree

August 2007 2:02

New Fossils Extend Branches of Family Tree

Burn Scars

August 2007 2:02

Burn Scars of a Treasured Forest

Stem Cells Made From Eggs

July 2007 2:02

Stem Cells Made from Eggs Alone

July 2007 1:52

Climate Change Affects Ecosystems

TracingThumb

July 2007 2:02

Tracing the First Americans

Ancient Immunity

July 2007 2:02

Ancient Immunity May Have Upped HIV Risk

July 2007 1:52

Record-Breaking Fire Season

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