Answer:
if u talk about coolest inventions then I'ma say
Step-by-step explanation:
satelite- is the best invention it gives you free light because of the energy of the sun it can be used in many things
Last But not least
Robots - they're the most rare stuff in the world but are goin to be common after some years they can almost do anything which humans do they weakness is water
Hope it helps ya ItzAlex