good websites?

so i like websites that can teach me interesting junk. how-to sites, common knowledge i may have missed, not so common knowledge, peculiar news… alot of sites i run into are really stupid and start listing lame trivia facts and stuff that just isnt all that interesting. i dont want to here about stuff that isnt useful. im looking for things that make me think–that i can apply. those of u who also spend too much time surfing the web and being frustrated with all the useless junk taking up space prob kinda get wat i mean. my interests are actually really wide, so im just looking for lots of suggestions here. tell me ur fav finds that i may not know of. thanks much!!!