Researchers from Carnegie Mellon and Microsoft Research have taken touchscreens to the next level. They’ve developed the prototype for a revolutionary new tecchnology that allows users to turn their hands and arms into touchscreens. The Skinput system uses a tiny projector in an armband to display interactive images on the user’s skin. The armband also houses sensors that detect taps on the skin. See the system in action in this YouTube video and read more about it on ZDNet.

Popular Science magazine just made its 137-year archive available online, with no charge for browsing. PopSci.com, the official website for Popular Science, has partnered with Google to provide the full contents of each issue, including the original advertisements. The archive is a mind-blowing resource, showing how people in the past thought about the future. It’s fascinating to see which scientific predictions came true and which remained just dreams.

The Google interface to the archive includes a search box to let you search by topic. You can also see a hyperlinked Table of Contents for each issue and jump to articles that way. The archive can be accessed via an iPhone. Prepare to lose yourself for several hours browsing through the interesting articles and stunning retro illustrations.

If you’d like to do your part to help the environment, consider investing in one of these eco-friendly Wikkerink Wallets. These unique wallets are made from recycled bicycle inner tubes combined with felt and fabric. The inner tubes are washed and treated until they’re as soft as velvet before being made into wallets. At $32, this wallet is a steal – especially since its durability will make it useful for a long, long time. Find out more at the Wikkerink Wallets website.

Feel like you’re going nowhere on the same old treadmill? The NordicTrack x7i Interactive Incline Trainer lets you take your workout all over the world. The x7i has the capability to download maps over Wi-Fi. Once you’ve downloaded a map and chosen a trial, the trainer shows the map on a small screen and the treadmill track raises and lowers to simulate the topography. Picture yourself running along San Francisco’s Golden Gate Trail, or maybe you’d like to design your own workout my specifying a route on Google Maps.

When you’ve finished your run, the x7i uploads your stats to the iFit website, where you can analyze your data and plan your next workout. The NordicTrack x7i Interactive Incline Trainer is on sale for $1999 at NordicTrack.com.