Willis Carrier invented the Air Conditioner, a few others.
This depends on which scientific invention you are referring to. I would say that yes, many inventions make us happy.
over 300
They only made 2 inventions
The ice cream come was one of the many inventions made in louisiana.
Ithink 41
He made 5 inventions.
over 1000 inventions from "The Wizard of Menlo Park"
29
A lot.
100
he made many inventions that were very succsesful and they were made with 19 letters of the alphabet.
120
This depends on which scientific invention you are referring to. I would say that yes, many inventions make us happy.
over 300
over 1000
one and that was the steam engine
There is no specific answer for how many inventions are in the world.