See also Hack 17 in Mindhacker: 60 Tips, Tricks, and Games to Take Your Mind to the Next Level (not the best link but you'll get close: https://books.google.no/books?id=kh8NbTzaalwC&printsec=front..., at the end of the section he recommends not following the 2003 book...)
See also Hack 17 in Mindhacker: 60 Tips, Tricks, and Games to Take Your Mind to the Next Level (not the best link but you'll get close: https://books.google.no/books?id=kh8NbTzaalwC&printsec=front..., at the end of the section he recommends not following the 2003 book...)