It's called "the summer brain drain" because during those long, hot months away from school, kids supposedly forget a lot of what they had learned in class.
Research, however, tells a more nuanced story: Some learning is lost among some groups, and others gain.
Here's what experts from Johns Hopkins University, the University of Tennessee, the University of Virginia and elsewhere say happens over the summer:
-- Most students -- regardless of family income or background -- lose 2 to 2 1/2 months of the math computational skills that they learned during the school year.
| Newsletter signup | Send us your ideas