Answer:
Gutenberg's moveable type printing press invention
Explanation:
Johann Gensfleisch von Gutenberg in 1450, Mainz, Germany, was the first to assemble and bring together complex systems and subsystems necessary to print a typographic book which was sought by printers in different countries such s Germany, France and the Netherlands. Gutenberg's moveable type, made use of ink made from boiled linseed oil colored with lampblack.
Answer:
protect our borders can be the correct solution for saving our own life and our lovely country
If you're asking for just two random explorers, then Meriwether Lewis and William Clark. But im not really sure if thats what youre asking or not...