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The iPad has a bigger screen, and so it has a bigger resolution. With the iPhone 4, however, Apple did something different: they increased the resolution without changing the physical size of the screen. This makes for a higher pixel density, pixels are smaller and more tightly packed. In one square inch of the iPhone 4’s screen there are around 106 thousand pixels (at 326 PPI, or Pixels per Inch), while the older models have only about 26 thousand (at 163 PPI) in an inch – 4 times less! This makes graphics on the screen seem like continuous lines, because your eye can’t see the individual pixels. Apple calls this technology the “Retina Display” because they claim the human eye (the retina) can’t physically see the pixels at this resolution.

Using Two Images The official way of adding high-resolution support to your application is by having two versions of each image, one in “regular” resolution and one in double resolution. Whenever your application is viewed on the Retina Display, the larger image will be loaded automatically. This method allows for full and precise control of how your application will look in each case, and is very easy to apply to your existing applications. The full size image file should be named however you want, such as “Button.png”. Use this image name in your code and Interface Builder wherever you want to reference the image. The double-size image should be twice the size of its matching smaller image and named exactly the same with “@2x” appended to the name. In our example, we would name it “Button@2x.png”. Unfortunately, this technique will not work on the iPad; a pixel-doubled application will not load the higher resolution resource. This will probably be addressed in the future iOS 4 update which is scheduled to come to iPad this fall.

As MOOCs cast their eye to the developing world, very minor tweaks matter a great deal, such as the ability to allow students to download, rather than only stream course videos. But even more major ones are coming, including edX’s plans to start open-sourcing its platform in the next few months, which could allow even more universities to post online courses, and software programmers around the world to experiment with customized interfaces.

“We need to make sure we are making tools that make it easy to create new content, so it’s not only someone at MIT or Stanford who creates.” Relevance, as he notes, is one of the biggest motivators for students.

One of the major challenges for MOOCs—which so far mostly come from U.S. universities—is to tailor the content of courses to a diverse worldwide audience with any number of combinations of language, educational, motivational, and cultural backgrounds. Critics fear the rise of big box education from only a few elite institutions in Western nations, and worry these may not fit the different learning styles in different nations.

The API supports a call to mouthPosition as well as left and right eye positions. T

Digital Cosmetic Mirror by industry giant Shiseido can be used to test make-up and recommendations without even having to pick up a mascara brush

Using augmented reality to do sampling is a novel way to involve consumers, and can be a useful technology for saving on waste

The terminal then gives you tailored recommendations. Pressing a few buttons on the touch-screen paints make-up onto your image in realtime, allowing you to see the results instantly. You also try out make-up that is currently making waves, along with printing out before and after photos with product information for you to go make the purchase of whichever colors caught your eye the most.

Everyone has their strengths and weaknesses. If you want to lead a team or be a part of one, with an eye towards leveraging social media, it’s good to examine which roles people can play as part of that team. Marketing your site means putting the right people in place.