Some scientific ideas click right into place almost immediately, but some concepts take longer — and a lot of help — to land. Today we want to know about what finally made you get some of the more difficult-to-grasp concepts.

Tell us in the comments what the idea was, and then recreate the explanation that helped you to understand. If a picture, illustration, example, or video was involved, then we’d love to see that, too.

Image: Artist’s concept of a binary star going nova / Casey Reed, NASA.