iseriously didnt know that differnt contries were so differnt in their numbers and i never thpought about 13-19 i guess it wasnt ever that important to me... oh well i still dont get why england uses base-20?!?! i mean it just seems silly to me that they wouldnt use the first number in the tens place... but life goes on we will all get over it or atlast most of it but i am glad to know now that one billion - one billion doesnt always equal 0 (im going to trick some people at school on monday about that lol)