History of bifocals and trifocals
Benjamin Franklin, the early American statesman and inventor, is credited with creating the first multifocal lens for eyeglasses. Prior to Franklin's invention, anyone with presbyopia had to carry two pairs of eyeglasses — one for seeing distant objects and one for seeing up close.
There are numerous things that have turned out to be beneficial from the Crusades, such as:
- Trade with the East
This led to the introduction of lot of new things in Europe, food, spices, materials. That resulted in development of large, strong, wealthy trade cities, and it prompted a big rise in the European economy.
- Technological advancements
The technological advancements from the Arab world and from the Far East changed the course of the European history. They managed to learn how to make better weapons, built better ships, use the magnetic compass, and make better maps, eventually giving them advantage in colonizing the world.
- Rediscovering of the ancient Greek and Roman texts
The Arab world manage to preserve some of the ancient literature from the Greeks and the Romans, and they were reintroduced in Europe. They were very influential later in history as they managed to prompt the social changes in Europe that led to the Renaissance.
Archduke Francis was the heir to the Austrian Hungarian throne, who got killed in Bosnia by a member of the black hand, because Serbia wasnt happy with Austria Hungary taking over Bosnia
I believe the answer is m<span>ercantilism. </span>
