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A website that tells you, based on the year you graduated high school, what your school (probably) got wrong!
(yourschoolgotwrong.com)
A place for your preferably unique useful or fun sites and kind of a bookmark manager for me :p
Only if you went to school in the USA.
Several of the items hit the nail for me (German), too.
May depend on the decade. Form mine it was little but pop science stuff.