Psoralen

Psoralen is a special type of chemical that can be found in some plants. When you use a special light on psoralen, it gives off energy that can help things stick together. Scientists use psoralen to help fix things that are broken or cut, like DNA or hair. They put the psoralen on the broken thing and then shine a special light on it, and it helps glue it back together. It's like using a special glue that only works when you shine a light on it. But psoralen can also be harmful if you are exposed to too much of it, so it's important to be careful and use it only when you need to.