Imagine that you take a journey through time, starting in the age of the dinosaurs. You see plants and animals as they turn into
fossils, observe Charles Darwin take his voyage, and see him develop his theory. You also see signs of change in populations of organisms and their environments and observe the effects of mutations. Now, imagine that you arrive back in the present day, and everyone whom you tell about your adventure does not believe you. What evidence from the present day could you use to prove that you have taken this journey?
You take any of the "signs of change in populations of organisms and their environments". For imagine, Australopithecus (early man) turning to Homo sapiens. In that way they could tell that you took this journey.
Lasers can be used in surgical operation such as eye surgery because they are so precise.
The laser can be used in microscopy to produce very clear visuals and study very minute substances.
Lasers can be used in navigation also due to their precision hence reducing accidents
We use lasers to scan barcodes in supermarkets
Powerful lasers can also be used or security purpose for shooting down flying objects that can cause damage to humanity, such as missile and asteroids.
A phenomenon called laser cooling has been used to trap an atom and assist in its study so scientists are able to understand the universe.
