EAN-139780756697891   EAN-13 barcode 9780756697891
Product NameOptical Illusions
CategoryBook / Magazine / Publication
Short DescriptionHeight:1.21 inches / Length:11.12 inches / Weight:1.8 pounds / Width:8.81 inches
Amazon.comA Buy on Amazon ~ 0756697891
Price New3.99 US Dollars    (curriencies)
Price Used1.52 US Dollars    (curriencies)
Width1.19 inches    (convert)
Height11.13 inches    (convert)
Length8.81 inches    (convert)
Weight28.8 ounces    (convert)
AuthorDk Publishing
Page Count32
  • Book of optical illusions and facts about illusions
  • Encourages reading skills, logic, critical thinking, an interest in science
  • The reality behind illusions makes children's minds reel
  • 49 real optical illusion examples
  • Includes build-your-own optical illusion activity
Long DescriptionWith the dynamic interactive Optical Illusions, each time readers turn the page, lift the flaps, or pull the tabs, they'll be confronted with an even more amazing optical illusion!

This guide to the world of eye-tricks is fun for the entire family — providing new and gasp-inducing moments on each page. Along with the illusions, which include a spinning thaumatrope, a stereoscope, and an entrancing 3D sculpture that "follows" you around the room, readers will welcome learning the latest theories about why illusions fool us.

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Created11-21-2012 11:21:37am
Modified09-13-2017 2:35:04pm
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Well heck! We had another upgrade of hardware today and the process simply took far longer than expected. Sorry!

Yes, we added some more new hardware. To insure that nothing got lost we had to perform a full database backup.

This backup required copying over 70gig of data from one machine to another and this required a complete database shutdown.

Now this step took longer than expected but that wasn't all, installing the new hardware took longer than expected.

The good news? We now have new servers for both the web server and the database server PLUS backup equipment for both servers. The old equipment has been recycled into massive file servers and backup servers so we haven't wasted anything.

The hope is that all these upgrades over the past couple weeks will improve over all system performance and reliability. With all the traffic we have been seeing lately, the old database server and web server have been getting pushed to their limits. We now have some breathing room again.

Thanks for your patients.