As others have stated, thermal compound/paste is what you want. See the video in the following link if you aren’t sure what to do.
https://www.youtube.com/watch?v=9VSDkB-3st4
lol, now that’s an option! Quite tempted actually- but I would want usb3 ports, and dvd/write/rewrite capabilities at least- plus ability to add in a graphics card-