The New York Times reports on a new study that basically says <A HREF="http://tech.yahoo.com/blogs/null/23819/multitasking-will-make-your-brain-explode">multitasking actually makes you less efficient</A> than if you concentrated on one thing at a time.

To some extent, this is common sense. It's long been known that talking on a cell phone while driving a car is exceedingly dangerous. Some studies say it's just as bad as driving drunk.

The key is that you lose time and focus when you switch between tasks.