So imagine you have a big toy box filled with lots of different kinds of toys. You really like building things with blocks, but you also have toy cars, trucks, and planes.
Now pretend that some grown-ups want to use your toy box for something very important. They want to build big things like tunnels, canals, and even a huge harbor! But they don’t want to use normal tools like shovels, they want to use special toys that they call nuclear bombs.
This is where Project Plowshare comes in. Some very smart people thought that if you could use nuclear bombs to do things like dig big holes or move lots of earth, it would be faster and easier than using regular tools. They called it “peaceful uses of nuclear explosives”.
But some other people didn't like this idea because nuclear bombs are very dangerous and can hurt a lot of people. They thought that the risks of playing with nuclear bombs were too high, and that it could cause big problems for the environment and people nearby.
So, in the end, Project Plowshare was not used very much because the risks were seen as too great. It's important to remember that even when grown-ups have new ideas, it's always important to think about what might happen if things go wrong.