One of the most used, best inventions of all time! (In my opinion)
If I think of one thing that so many people around the world use, it would be a bike.
Just about every child owned one growing up.
If you have ever traveled to other countries, you will see that so many people use bikes as their main form of transportation.
In Amsterdam, it is almost impossible to cross the street because of the amount of bikers.
The bike has evolved over time.
In fact, one of Leonardo Da Vinci's students in the 1490's made rough drafts of a bicycle.
The drafts were not discovered until 1966.
Look what has developed since then!
I wonder what we will see in 20 years from now.