You need to keep in mind that schools obtaining new school text books run into two problems.
1) Cost. ONE elementary school book costs typically between $50 to $75 (schools typically pay near full price when buying in bulk). As a result most schools simply cannot afford to buy more or the latest version of a textbook.
2) Publishing. Sometimes a new edition/revision is not published on a yearly basis but rather every few years. But even if one has been published the school might run in to financial cost.
My eldest daughter's music books (
Essential Elements 2000 books
1 &
2 cost $10.95 each) was written in 2000 and contains errors. The publisher and author of the book acknowledges the error but has not issued a revision of the music book nor plans on releasing a revision of said book until 2010.
My other daughter's BRAND NEW book,
On Your Mark, Level 3-2: Trophies Series (0153224770) has a list price of $50 through BN.com. I'm going to have to replace it since she brought it home over the Spring Break and it was ruined when she left it on the floor and her brothers (the twins) decided it was a coloring book.
But suffice it to say due to the cost of the books and the publishing companies, textbooks in elementary through high school maybe (and are) out of date.
Whose fault is this? Not the taxpayers. It is typically the government's fault for not providing more money towards education all the while the politicians continue to vote for pay increases. Where does the politicians fat paycheck come from? The money the taxpayers pay. If the politicians weren't so greedy and allotted that money to education then schools could afford new textbooks.
It's even worse for science. If your teacher isn't up on the cutting edge (and good lord, he/she should be! That's the job!) of what's new in science, it's really easy for the classroom to be left behind in the science of the 1970s or 1980s.
That's kind of unfair because many science teachers are not scientists nor are trained to be science teachers in the first place. Due to a shortage of teachers that specialize in science, many schools make due with teachers who go on to take more classes to fill those spots. Blame the school districts for not hiring qualified teachers but blame the government first since they don't provide the money needed to hire qualified teachers to begin with.