We were lucky enough to have Angela from YouTube EDU come to visit on Monday.
She was joined by elusive YouTuber CGPGrey - here we're photographed at Nottingham's Robin Hood Statue.
Brady, CGP Grey and Angela
Most of the day was spent at the University of Nottingham, where periodicvideos and sixtysymbols are filmed.
With Professor Martyn Poliakoff
We were also hosted by Dr Mike Fay at the Nottingham Nanoscience and Nanotechnology Centre.
There Mike was able to engrave the YouTube EDU logo onto a few hairs, including one of Angela's!
A hair (note scale bars in bottom right corners)
The logo was etched with a beam of gallium ions
Dr Mike Fay at work on the logos
The small logo can be seen on a "huge" hair
The logos are imaged with an electron microscope
Mike returns Angela's strand of hair
Invisible to the human eye - but we promise it's there!