Pence touches

20170707-Comic-RRfJTG-Pence touches space hardware-aa-1080x1080

The reason not to touch is that human hands have a microfine layer of oil on them that will leave a residue on whatever they touch. For a piece that may be subjected to temperatures of several thousand degrees, the oil film absorbs heat and causes a localized extra hot spot that can melt into whatever has been touched. I’ve heard that after space shuttle flights, especially first flights, the tiles will have multiple melted in spots that require the tile to be replaced before the next flight due to people touching before a flight.