found a treasure box :D

http://www.archive.org/details/sketchofphcosmos01humbrich
http://www.archive.org/stream/historyofscience01willuoft#page/n5/mode/2up


:)

There are some people to whom you say goodbye all your life. There some that are forgotten already after they close the door. And there are some who come and go ... again and again

sometimes nothing is more important than to know that someone is ... is somewhere in this world

nice paper :-)

Walking on a Graph with a Magnifying Glass