I learned about suspension bridges, fire hydrants, and locomotives. I will describe and explain what all these inventions did to help the world evolve.
The suspension bridge is a bridge hung by strong chains or wire. The suspension bridge was cheap, easy to build, and super strong. So without the suspension bridge it would be very hard to get across big bodies of water quickly. Fun fact: suspension bridges used to be made by laying planks of wood across tree vines.
The fire hydrant is basically a pipe that sticks out of the ground with a fancy cap over it. Fire hydrants are used to help put out fires. A firefighter attaches the hose to the fire hydrant and turns a knob. Then water flows into the hose. Because of the fire hydrant, many houses and lives can be saved. Fun fact: Unlike in the movies, if a car hits a fire hydrant a fountain of water will not erupt.
The locomotive is an engine that is used to pull things like carts along a track. Things like coal could be brought from mines a lot faster than it could be done by a horse; it could also be used to carry humans from one place to another. Because of this increased speed, work could be done a lot faster than normal. Fun fact: carriages used to be attached to the locomotive to be used as carts.
So finally, I learned about three inventions, suspension bridges, fire hydrants, and locomotives which all have helped improve life.