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The Discoveries: Great Breakthroughs in 20th Century Science includes the original scientific papers. This is a fantastic book! Alan Lightman paints the context for each discovery, before presenting the original paper.
Gift certificates are great! Especially as gifts for kids' teachers!
Science & Tech:
Edmund Scientifics Gift Certificates
For the kitchen:
Sur La Table Gift Certificates
The Perfect Gift - A CHEFS Catalog Gift Card
Family:
Leaps & Bounds Gift Certificates
Peter Sis's illustrations are in a class of their own--combining traditional etching with and modern techniques. His illustrated biographies of Charles Darwin and Gallileo Galiliei are detailed and mesmerizing. He captures the brilliance of these two great thinkers, and adds his own. These two books are essentials for any library, for either children or grown. I bought them for myself, but my kids love them.
DK Visual Encyclopedia of Science
I love DK books, and their fantatic photo illustrations. While this book is really a reference, it's also lots of fun to cuddle up with your pre-reader and explore page after page of fascinating pictures. You can read the captions for the images that interest them. A great way to spark curiosity early, and get them excited about "looking it up".