Watch videos from the Koshland Science Museum, the National Academy of Sciences and other highly-respected science sources.
Compares satellite images from 1993, 1997 and 2003 to infer changes in population, energy consumption, energy efficiency and economic activity.
Climate can exhibit abrupt shifts over large regions of the world. As the last glacial period was giving way to the current warm interglacial period, average temperatures in Greenland returned to glacial levels for more than 1,000 years. This unusual period, which is called the Younger Dryas, ended abruptly about 12,000 years ago. Evidence from an ice core drilled in Greenland indicates that temperatures there rose approximately 15°F (8°C) in less than a decade. No Audio.
During the last Ice Age, approximately one-third of all land was covered by glaciers. Glaciers reached as far south as New York City. This huge volume of ice reduced the amount of water in the oceans, which lowered sea level by several hundred feet. As a result, a land bridge joined Siberia to Alaska, making travel between the two continents possible. No audio.
Watch the continuous process of evolution starting with a single E. coli bacterium. (no audio)
This video explores the HIV life cycle and the points in the life cycle that can be affected by antiretroviral drugs.
Thriving and surviving in the face of adversity.
Why Do We Age? describes some of the science behind biological aging.
We live in a multitasking world. Many of us switch our attention between texting, watching television, listening to music, surfing the internet and other tasks. Can we truly do two things at once or is multitasking diminishing our focus -- in the classroom, at home and on the road? Driving, which requires focus, highlights the challenges of switching between tasks.