Technologies timeline

Connect to this page in the internet:

http://www.datesandevents.org/events-timelines/12-technology-timeline.htm
Answer these questions:

• When did they invent the first known calculator?
• Where did they invent the suspension bridges?
• Who invented the microscope? When?
• Vaccunation was a breaktrouh in medicine. When was it invented? Who did it?
• When was electric motor invented?
• In which two centuries have more inventions happened?