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Mark up websites, graphics, and photos, or start brainstorming on a blank canvas. Browse the web with your friends or make that conference call more productive than ever. No plug-ins, downloads, or firewall voodoo - it's all here, ready to go when you are. Browser-agnostic, user-friendly.

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.

The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the change in frequency of a wave for an observer moving relative to the source of the wave. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. 

" Dim Lights Share a clea.nr URL: Hide Comments, Favorites, Suggested Videos, etc. There is a common perception that weight and mass are basically the same thing. This video aims to tease out the difference between mass and weight by asking people what makes a car difficult to push. The standard answer is that it is difficult to push because it's heavy. But heaviness is a measure of weight, the gravitational pull of the Earth attracting the car to Earth's center. When the car is pushed on a flat road, the force of gravity does not oppose the motion. Instead the resistance felt is an indication of the car's mass which determines its inertia. Inertia is the property of matter that means it tends to resist acceleration - the greater the mass, the less the acceleration for a given amount of force. Subscribe 109 videos 32,519 Like Add to Share Uploaded by 1veritasium on Feb 7, 2011 There is a common perception that weight and mass are basically the same thing. This video aims to tease out the difference between mass and weight by asking people what makes a car difficult to push. The standard answer is that it is difficult to push because it's heavy. But heaviness is a measure of weight, the gravitational pull of the Earth attracting the car to Earth's center. When the car is pushed on a flat road, the force of gravity does not oppose the motion. Instead the resistance felt is an indication of the car's mass which determines its inertia. Inertia is the property of matter that means it tends to resist acceleration - the greater the mass, the less the acceleration for a given amount of force. 320 likes, 14 dislikes Show more Uploader Comments ( 1veritasium ) Actually, it is the friction which is causing difficulty in moving the car. Ideally if there is no friction, whether rolling or sliding, even the slightest of the force would make the car move. You could actually be able to move the car with a push of your little finger if there is no friction at

The scale of the experiment matches the scale of the intellectual leap achieved. A huge apparatus, 27 kilometres in circumference, buried 100 metres below the French-Swiss border near Geneva, accelerated particles in a near-perfect vacuum to speeds just below that of light and measured the effect of their collisions. Minute variations in energy released prove the existence of the Higgs boson, which had been postulated in theory by Peter Higgs in 1964 to explain the mass of elementary particles. Wednesday's discovery, published by two separate groups of researchers working in isolation from each other, can be compared with the discovery of DNA, or Einstein's theory of relativity, or the splitting of the atom. Achievements such as those are like peaks in a mountain range. They draw the world's attention, but really it is the great mass of the range itself that holds the peaks up which has more significance. Without the massive bulk below, the peaks would not reach so high. For science that great mass is a huge amount of lead-up work. The standard model of particle physics is the work of many hundreds of researchers, only one of whom was Professor Higgs. That achievement sits within the millions of achievements of the wider research effort of the whole science community. And that is enclosed, too, within the wider community which understands and supports what science has achieved and can achieve. Read more: http://www.smh.com.au/opinion/editorial/science-gets-a-chance-to-show-the-way-20120706-21mf2.html#ixzz21rjUGfs0

Import and edit slide shows and videos Quickly add photos and footage from your PC or camera into Movie Maker. Then fine tune your movie just the way you want it. You can move things around, speed it up or slow it down-it's up to you.

Use of cigarette butts and chewing gum to identify people?

Cool video that shows how a can of coke will sink in water but a can of diet coke wont due to the differences in the amount of sugar in the cans.

"http://yt.cl.nr/8V2ncwumv9o" Col. Joseph Kittinger -1960 - set world records for highest parachuting jump (102,800 ft. or 20 miles, 31km), highest balloon jump and fastest speed (close to speed of sound) by a person through the atmosphere.

Armsign have vast experience in the design and manufacture of botanical signs and labels. Using materials that sit naturally in their surroundings we create wonderful informational, educational and directional signage or displays.

"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.

Presbyterian Ladies College Sydney is hosting the 9th National Interactive Teaching and Learning Conference on 9,10,11 August, 2012.  A number of teachers at the school are presenting workshops and presentations at this event. This wiki site has been set up to provide a place for PLC Sydney teachers to load any links, resources or assets mentioned in their presentations. If you attended a workshop session run by a PLC teacher, look for the resources by clicking the name of the session in the menu on the left.

Photo collages celebrate important events and themes in our lives. Pick a folder, press a button, and in a few minutes AutoCollage presents you with a unique memento to print or email to your family and friends.

Add, discuss and organize ideas from multiple locations before, during and after (or instead of) your meetings.

Quiz that is simple, gives instant feedback and a final score. Note that students should not sign in to facebook or twitter to obtain their final score.

"http://yt.cl.nr/mezkHBPLZ4A"