Pencils

The pencil was invented in 1975 by Nicholas-Jacques Conte.  I usually use a pencil instead of a pen.  You can erase with pencil but not pen.  I doodle a lot with pencils.  I like mechanical pencils better than regular yellow pencils.  I think pencils will always be around.  They are very helpful and useful. 
http://www.enchantedlearning.com/inventors/page/p/pencil.shtml