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Japan's Nuclear Crisis Explained in Four Minutes with clear graphics about the workings of the reactors.

The evolution of the peppered moth over the last two hundred years has been studied in detail. Originally, the vast majority of peppered moths had light colouration, which effectively camouflaged them against the light-coloured trees and lichens which they rested upon. However, because of widespread pollution during the Industrial Revolution in England, many of the lichens died out, and the trees that peppered moths rested on became blackened by soot, causing most of the light-coloured moths, or typica, to die off from predation. At the same time, the dark-coloured, or melanic, moths, carbonaria, flourished because of their ability to hide on the darkened trees.

Journey back in time to the Ice Age and witness one of the world's deadliest animal killers - the tar pit. With enough force and consistency to kill a fully grown mammoth, was crude oil the biggest threat to species survival in early Earth?

In the last physics lesson, the teacher seemed to have to explain the Doppler effect for quite a long time to some people before they understood it. So, being the nice, considerate, thoughtful person I am, I decided out of the goodness of my golden heart to explain the Doppler effect for future reference using animation (actually, I thought it would be a fun thing to do anyway). For those of you who are confused about what the Doppler effect has to do with anything, it's red shift and blue shift. So it is relevant to the lesson.

Tackling greenhouse gas (GHG) emissions is considered to be one of the most serious national and international challenges of our time. Australia has a sizable potential to mitigate GHG emissions and sequester carbon in agricultural production and land use systems.

"http://yt.cl.nr/_mCC-68LyZM" If you drop a heavy object and a light object simultaneously, which one will reach the ground first? A lot of people will say the heavy object, but what about those who know both will land at the same time? What do they think? Some believe both objects have the same gravitational pull on them and/or both fall to the ground with the same constant speed. Neither of these things is true, however. The force is greater on the heavy object and both objects accelerate at the same rate as they approach the earth, i.e. they both speed up but at the same rate.

Interactive graphs of gold medal-winning times for Olympians in a range of sports over the span of the Olympics.

The graph below shows the progression of gold medalists' times for the 100-meter sprint since 1896. Use the zoom controls at the top right to get a closer look, and hover over the points to learn each year's result. While zoomed, click and drag the timeline to view later years.

"http://yt.cl.nr/Whd4EIGJbU0" Watch as liquid nitrogen instantly transforms a standard sugar and cream mixture into ice cream -- without any measurable time elapsing.

Watch http://www.youtube.com/watch?v=CDWKAAxL10Q to get the most out of this site. 

Great interactive website - CSI based investigations, great for Year 7 forensics but also covers disease, careers in science and substance abuse

Westerners associate terrorism in Pakistan with suicide bombers, but an emerging terrorist threat for Pakistani women is acid attacks.

Women's Track & Field world records, as recognized by the International Association of Athletics Federations (IAAF).