I apologize for off-topic, I'm considering about building an interesting web-site for young students. Will possibly begin with publishing interesting facts like"Mexico City sinks about 10 inches a year"Please let me know if  you know where I can find some related info such as here
 
http://stevenrgerst.com/i46-hn/06/articles-nydpoXQ-2256/function.include
http://stevenrgerst.com/fhgbv/7/837-fjh-juy4875-0608.html