100 Ways to Develop Your Mind

I'd like to know if some of these suggestions have some kind of scientific or at least anecdotal evidence.

Some sound pretty radical, but interesting (a whole day blindfolded?)

I can vouch for Number 41 (also number 64)... I had no TV for five years (got one as a gift, and still don't watch it), had no Internet for one of those five (much harder than no TV!), and I found out I really don't miss the news, and don't miss out on much important (I've missed on a transportation strike announcement a few times, or on the weather, but nothing serious).