Today, there are over 7,000 languages spoken throughout the world. They may sound different, but in every case, they're drawing on the same regions of the brain. If you had told me that stone-tool-making had something to do with our ability to speak, I would have said you've got rocks in your head, but the latest studies indicate that once Homo erectus got creative with stone, our brains were on the way to inventing the most powerful tool of all: language.

The Kindle is the most successful electronic book-reading tablet so far, but that's not saying much; Silicon Valley is littered with the corpses of e-book reader projects.

If you continue to improve a product enough, you'll eventually ruin it.

The biggest surprise watching video on the tiny, 2.5-inch screen (320 by 240 pixels) is completely immersive. Three unexpected factors are at work. First, the picture itself is sharp and vivid, with crisp action that never smears the screen is noticeably brighter than on previous iPods. Second, because the audio is piped directly into your ear sockets, it has much higher fidelity and presence than most peoples TV sets. Finally, remember that a 2.5-inch screen a foot from your face fills as much of your vision as a much larger screen thats across the room.

One day robots may even babysit our kids, a job that has always required a human touch.

Today, there are over 7,000 languages spoken throughout the world. They may sound different, but in every case, they're drawing on the same regions of the brain. If you had told me that stone-tool-making had something to do with our ability to speak, I would have said you've got rocks in your head, but the latest studies indicate that once Homo erectus got creative with stone, our brains were on the way to inventing the most powerful tool of all: language.

The Kindle is just the razor. The books are the blades - ka-ching!