http://www.wiadomosci24.pl/artykul/ceny_metamfetaminy_w_krajach_azji_sa_nizsze_od_hamburgerow_331503.html Autor: Grumpy-Puddin/Flickr Mat. ilustr. http://www.psypost.org/2014/11/smart-drugs-wont-make-smart-people-smarter-29406 Licencja: CC4.0
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