EAN-139780753462492   EAN-13 barcode 9780753462492
Product NameI Wonder Why There's A Hole In The Sky: And Other Questions About The Environment
CategoryBook / Magazine / Publication
Amazon.comA Buy on Amazon ~ 0753462494
Price New3.23 US Dollars    (curriencies)
Price Used1.20 US Dollars    (curriencies)
Long Description
There is probably no better time to listen to children's questions about the environment and provide them with clear-cut, honest answers.

I Wonder Why There's a Hole in the Sky takes a look at our planet, how we are damaging it, and what we can do to protect it. It addresses all of the relevant questions about the state of the environment, covering important topics such as pollution, global warming, endangered animals, climate change, and extreme weather. The fluent, child-friendly, and thought-provoking text combines with colorful illustrations and lighthearted cartoons to make this a perfect introduction to "green" issues for young environmentalists.
I Wonder Why There's a Hole in the Sky is a 2009 Bank Street - Best Children's Book of the Year.
Created11-22-2012 12:34:44pm
Modified12-23-2013 8:13:48am
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Article of interest

ISBN stands for International Standard Book Number. Originally this was a 10 digit number known as ISBN-10, but has been replaced with a 13 digit version known as ISBN-13 (aka EAN-13) to better fit in with the industry standard product numbering system.

The ISBN system offers a unique numbering system for books and publications of various types. ISBN offers 9 identification digits for each book or publication and one check digit. ISBN-13 expands the available number set by doubling the available numbers. You might think that the extra three digits would more than double the available numbers but ISBN is limited within the EAN-13 numbering system and will always start with 978 or 979 as the first three digits, leaving only 9 more digits for the actual identification digits and again the last digit is the check digit.

Any ISBN-10 number can be converted to ISBN-13. Any ISBN-13 number that starts with 978 can be converted back to ISBN-10. ISBN-13 numbers that start with 979 cannot be converted to ISBN-10.

The conversion process from ISBN-10 to ISBN-13 is a rather simple one. Start with the first 9 digits of the ISBN-10 number, place 978 in front and calculate the new check digit using the standard EAN check digit calculation.

If you want to calculate the check digit for ISBN-10, that is done using a MOD-11 calculation that is very different than the EAN check digit process.


Look at the number above and below the barcode. You will see that except for the last digit in the ISBN number, all of the digits exist in the 13 digit version shown under the barcode right after the 978 and just before the new check digit of 5.

Now you can see how easy it is to convert between ISBN-10 and ISBN-13.