Devonian tetrapod-like fish and the evolution of the tetrapod body plan
The relationship of limbed vertebrates (tetrapods) to lobe-finned fish (sarcopterygians) is well established, but the origin of major tetrapod features has remained obscure for lack of fossils that document the sequence of evolutionary changes
http://www.nature.com/nature/journal/v440/n7085/abs/natur...

"Biggest Fish Ever Found" Unearthed in U.K.
Discovered in clay pits near Peterborough, the fossil is the largest known fish ever . Leedsichthys problematicus swam the world's oceans some 155 million years ago. National Geographic Oct 1,2003
http://news.nationalgeographic.com/news/2003/10/1001_0310...

'Doomsday' seed vault opens in Norway
Dubbed the "Doomsday Vault," the seed bank on a remote island near the Arctic Ocean is considered the ultimate safety net for the world's seed collections, protecting them from a wide range of threats including war, natural disasters...
http://www.cnn.com/2008/WORLD/europe/02/26/norway.seeds/

A Walk Through Human Evolution
The newest fossils have brought scientists close to the time when humans first walked upright~
http://www.time.com/time/covers/1101010723/timeline.html

AC, DC and Electrical Signals
AC means Alternating Current and DC means Direct Current. AC and DC are also used when referring to voltages and electrical signals which are not currents!
http://www.kpsec.freeuk.com/acdc.htm

AC/DC: What's the Difference?
AC/DC: What's the Difference?
http://www.pbs.org/wgbh/amex/edison/sfeature/acdc.html

Aerodynamics of Kites
An excellent way for students to gain a feel for aerodynamic forces is to fly a kite
http://www.grc.nasa.gov/WWW/K-12/airplane/kiteaero.html

Air Pressure
An important property of any gas is its pressure
http://www.lerc.nasa.gov/WWW/K-12/airplane/pressure.html

Air Pressure
How can you measure air? Can you see pure air? Can you feel it? Air pressure is the weight of air pressing on every part of your body, and everything around you, right now.
http://www.miamisci.org/hurricane/airpressure.html

Air Pressure
Air Pressure: This demonstration is for teachers to do for their students.
http://avc.comm.nsdlib.org/cgi-bin/wiki_grade_interface.p...