https://www.youtube.com/watch?v=ORPfV5VC_dU&list=UU0vBXGSyV14uvJ4hECDOl0Q Because I didn't even know about the different types there was.
https://www.youtube.com/watch?v=gohE6cytlFU&list=UUkWQ0gDrqOCarmUKmppD7GQ Because I wasn't very knowledgeable about radiators until I watched that video.