Hello. 
I`ve got an expierence with theese guys http://beadbanter.com/cgi-bin/gforum/gforum.cgi?post=3211;sb=post_latest_reply;so=ASC;forum_view=forum_view_collapsed;page=last;guest=85926292
https://www.xroxy.com/xorum/viewtopic.php?p=215425
http://molbiol.ru/forums/index.php?showtopic=638765&langid=en
http://mm.fe.unp.ac.id/comment/195608
https://community.theminoritymindset.com/topic/for-what-reason-do-students-get-poor-grades?reply=690099228746265889
  that were mentioned before. 
And I watned to claim thanks!

MichaelVig