Okay kiddo, Speiser v. Randall was a very important court case that happened a long time ago in the United States. It was about whether people had to pay extra taxes if they made a lot of money.
You know how sometimes when you go to a store, if you buy more things, you have to pay more money? Well, with taxes it's kind of like that too. The more money you make in a year, the more taxes you have to pay to the government.
But some people thought this wasn't fair. They said that everyone should have to pay the same amount of taxes, no matter how much money they make. This is called a "flat tax."
So, Mr. Speiser and some other people didn't want to pay the extra taxes that the government wanted them to pay. They took the government to court and argued that it wasn't fair.
The court had to decide whether the extra taxes were legal or not. They looked at the laws and the Constitution and finally decided that the government was allowed to charge extra taxes to people who made more money. The court said that it was fair because people who make more money can afford to pay more taxes, and it helps to pay for things like schools and hospitals.
So, in the end, the court ruled that the extra taxes were legal and people still have to pay more taxes if they make a lot of money. And that's the story of Speiser v. Randall!