3 INVENTIONS

Bicycle: the bicycle was invented by Karl Drais in 1817. It had two wheels and 

handlebars, but it didn't have any pedals! The person who used it had to move it with his 

legs.

                                 

Helicopter: the first helicopter was made by Leonardo Da Vinci in 1490. It 

measured 15 meters, and the clothes rotate over an axis, making it to fly.

                             

Computer: the first computer was called "Z1". The Z1 was invented by Konrad 

Zuse in 1936, and it weight 1000 kilograms. It could calculate multiplications in 

ten seconds.