Tests of relativistic energy and momentum
So, Einstein was a very smart man who had some very cool ideas about how things work in the universe. One of his ideas was that energy and momentum (which means how much something is moving and how much force it has) change depending on how fast you're going.
To test this idea, scientists have done experiments where they send tiny particles called electrons really fast and watch what happens. They've found out that the electrons behave in a way that agrees with what Einstein said about energy and momentum changing when things are moving really fast.
This helps us understand how things work in the universe, and it's also cool to think that we can figure out really complicated things just by playing around with tiny particles and watching what happens!
To test this idea, scientists have done experiments where they send tiny particles called electrons really fast and watch what happens. They've found out that the electrons behave in a way that agrees with what Einstein said about energy and momentum changing when things are moving really fast.
This helps us understand how things work in the universe, and it's also cool to think that we can figure out really complicated things just by playing around with tiny particles and watching what happens!