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The vaccine
Edward Jenner took material from a cowpox virus pustular lesion on the hand of milkmaid Sarah Nelmes and inoculated it into the arm of 8-year-old James Phipps, son of the Jenner family gardener.
Advantages: Contract mild flu, Prevention of flu viruses, Less likely to suffer from Guillain-Barré syndrome than people sick with influenza.
Disadvantages: It is not a flu shot, the repetitive adverse effect same painful site. -
Lightning rod
Benjamin Franklin invented the lightning rod.
It was an instrument that draws an ionized beam from the air to conduct the discharge to the ground, so that it does not cause damage to people or buildings.
Advantage:
Avoid serious electrical accidents in the building
Decreases the intensity of lightning by redirecting its current.
Reduces the probability of fires.
Disadvantages:
It causes health problems such as:
Heart attack
Electrocution
First degree burns -
Car
Cugnot, who was a French writer and inventor, took the big step, building a steam car, initially designed to pull artillery pieces. It was a tricycle that mounted on the front wheel a boiler and an engine with two vertical cylinders and 50 liters of displacement.
advantage:
A safer means of transport
Makes many tasks easy
Save money and take trips
Disadvantages:
gasoline is not cheap
Not cheap tires
taxes -
The Bike
Mainly called Draisian by Drais Saverboon.
At first it was a children's toy, but the German engineer Karlvon Dams fixed it for a means of transportation. It was also called a bicycle.
advantage:
Helps you improve VO2 max.
improve your performance
relieve your boredom
Disadvantages:
The risk
How much it rains or how cold it is
The distance -
Phone
The conventional telephone is made up of two circuits that work together: the conversation circuit, which is the analog part, and the dialing circuit, which handles the dialing and her call travels over that same line of only two wires. Alexander Graham Bell created it.
advantage:
Record audio and video
Take pictures
Send messages and receive text messages
Disadvantages:
Headache
Insomnia
increased stress