Most education experts say kids lose about three months of knowledge over the summer. Fortunately, there are ways to keep what your kids learned last year firmly inside their head. This week, we review three books that, besides offering a great way to stay connected to your kids, will help you brush up on a few subjects you probably haven't used in a decade.

'Summer Bridge Activities'

(Carson-Dellosa Publishing, Greensboro, NC)

This book (it's actually a series, one for the summer between each year of elementary school - 1-2, 2-3, 3-4, etc.) is pretty traditional, meaning it has worksheets, graphs, maps, and even some flashcards. But it manages to keep kids and parents engaged while reviewing last year's learning and getting a head start on next year's. Besides math, reading, writing, and other academic subjects, the books also include physical fitness (actually doing it, not just reading about it) and suggestions for family field trips.

'Bedtime Math: A Fun Excuse to Stay up Late'

by Laura Overdeck (Feiwel and Friends, New York)

Bedtime stories are a wonderful way for families to spend time together - and to get kids to learn to love books. The goal of "Bedtime Math" is to make math a fun, engaging part of our kids' lives, to make it as beloved as the bedtime story. Each section (there are more than 30) starts with fun piece of trivia about such topics as flamingos, bungee jumping, exploding food, and team mascots. Then, there's an equally fun math problem that uses what you just read as "props." Actually, there are three problems on the same topic: one that involves mostly simple addition and subtraction, one that might require some basic multiplication, and one that incorporates logic along with the other math functions. It's all such fun that you'll find yourself reading the book long after the kiddies have fallen asleep.

'Potentially Catastrophic Science: 50 Experiments for Daring Young Scientists'

by Sean Connolly (Workman, New York)

Despite the name, the experiments in this book aren't really all that dangerous - as long as you and the kids follow the directions. The book is like an archeological dig through 34 of the greatest scientific breakthroughs in human history. We start with Stone Age choppers and the discovery of fire more than a million years ago, and go all the way through rocket launches, lasers, and DNA. Each experiment includes a brief explanation of what made the invention so special, what it does, and where the potential for catastrophe was. It also includes step-by-step instructions for how to actually replicate what you've just read about? You'll have a blast - especially in the chapter that talks about gunpowder.

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