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and it's on top of continued growth in paperback sales." Since the beginning of the year, Amazon says that for every 100 paperbacks it has sold, 115 Kindle books have been sold. Kindle book sales are triple that of hardcovers.

Net income rose 8% to $416 million, or 91 cents per share, topping the estimate of 88 cents per share of analysts polled by FactSet. That compares with $384 million, or 85 cents per share, in the year-ago period. Revenue rose 36% to $12.95 billion. Analysts had expected $13.02 billion.

In more detail, he did the following: He created a free wiki using PBworks. For each course, he created a page on the wiki for the next exam. After each lecture, he put aside time to add the relevant notes to his wiki.  To do so, he would create a subpage for each topic, and then list the main points, add snippets of sample code, or summarize any other information relevant for the exam. Following the stealth studying philosophy, he would then access his wiki using his iPhone while walking to class and waiting for the lecture to begin, doing quick bursts of review. (PBworks plays nicely with iPhones, making it easy to browse the wiki on the run.)

But if you ask the experts, they are pretty unanimous that we don’t know much.

So are teenagers any better at oscillating?

“If they’re doing well, permitting them to have some choice permits them to find their own style.”

Laurel Trainor, director of the Institute for Music and the Mind at McMaster University in West Hamilton, Ontario, and colleagues compared preschool children who had taken music lessons with those who did not. Those with some training showed larger brain responses on a number of sound recognition tests given to the children. Her research indicated that musical training appears to modify the brain's auditory cortex.

Even a year or two of music training leads to enhanced levels of memory and attention when measured by the same type of tests that monitor electrical and magnetic impulses in the brain.

“We therefore hypothesize that musical training (but not necessarily passive listening to music) affects attention and memory, which provides a mechanism whereby musical training might lead to better learning across a number of domains," Trainor said.