Cybersecurity refers to the preventative techniques used to protect the integrity of networks, programs and data from attack, damage, or unauthorized access.
Pencils were invented in 1795 by a French scientist named Nicolas-Jacques Conte. He used a mixture of graphite, clay and water baked in a kiln to create the lead of the pencil. He then housed this mixture in a wooden frame for writing. Continue Reading.
1. Most pencils are made of cedar wood. Cedar can be found by the Great. Lakes. 2. Pencil lead is made from a form of carbon called graphite. Graphite cannot be found easily in the U.S. It is mainly imported from Sri Lanka or parts of Canada. 3. This graphite is then mixed with wax and clay. This wax is found mainly in Mexico, while the clay is found in the Southern parts of the U.S. 4. Ferrule, which holds the eraser to the wood, is made up of zinc and