Have you ever taken a picture with a camera? Well, scientists also use cameras, but they use them to take pictures of VERY tiny things that we can't see with our eyes, things called atoms and molecules. But sometimes, they need to take more detailed pictures of these tiny things from different angles, and that's where electron tomography comes in.
Think of electron tomography like a doctor taking an x-ray of your body. The doctor wants to see inside your body to see if anything is wrong, but they can't see inside with just their eyes. So, they use an x-ray machine to take pictures of the inside of your body. Scientists do something similar when they want to take pictures of tiny things like cells or bacteria.
But instead of using an x-ray machine, they use a really powerful microscope that can take pictures of things that are too small for us to see. And they take lots of pictures of the same thing from different angles, just like if a doctor took an x-ray of you from different sides.
Then, they use special computer programs to put all the pictures together like a puzzle, and they end up with a 3D picture of the tiny thing they were looking at. This lets them see it from lots of different angles, so they can see it in much more detail than before.
So, that's electron tomography – it's like taking really detailed pictures of tiny things from lots of angles so scientists can see them better.