You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Imagine you're a designer or mathematician living in the 21st century. Being a curious & imaginative sort, used to exploring wild ideas, you ask yourself: is there some way you can improve on the ARABIC numeral system? :D
Depending on what you count, I've spent anywhere between a few dozen and a few thousand hours on this 
Nothing published on this specific problem, but here's some related stuff: http://cognitivemedium.com/magic_paper/index.html … http://cognitivemedium.com/tat/index.html http://cognitivemedium.com/emm/emm.html
