1
people had to walk kilometers to communicate but with this invention, people now can communicate easiy
2
they are really useful when there is no electricity and we need to turn on a lamp
3
the first were made of wood in a shape of circunference and now, they are made of rubber.
4
the first invention that allowed people to fly long distances in less time
5
one of the most important inventions because people did not have to walk long distances anymore
