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With iOS 5 you can now use AirPlay to "mirror" your entire iPad screen and display or project it. All that is required is an iPad 2, the new iOS operating system and an Apple TV (which sells for around $100) that connects to any TV, monitor or projector with an HDMI interface. You can project your iPad with a couple of simple steps ... and it works wirelessly! Here's how:

When Drop.io announced that they had sold out to Facebook and would be shutting down effective on December 15th, I immediately shared that news with you. One of the services offered by Drop.io that I'm really going to miss is their hidden upload tool which allowed you to have others submit files to your drop. For the last couple of years I used Drop.io's hidden uploader to collect assignments from students.

"By 2050, a third of the people on Earth may lack a clean, secure source of water. Join National Geographic in exploring the local stories and global trends that define the world's water crisis. Learn about freshwater resources and how they are used to feed, power, and sustain all life. See how the forces of technology, climate, human nature, and policy create challenges and drive solutions for a sustainable planet."

A really? moment Prime numbers are found hidden in nature, but humans have made spectacular use of them, writes mathematician Marcus du Sautoy.

MUSIC & EAR TRAINING GAMES * Train your ear with fun music games * Sharpen your sense of pitch and tone * Unlock the hidden patterns in music * Strengthen your music theory skills