Scientists claim to have sent the Queen her smallest birthday message - etched on a strand of hair from a corgi.
Experts at the University of Nottingham used ion beam technology to inscribe the words "Happy 90th Birthday Your Majesty" on the tiny hair fibre.
Corgis Cracker and CJ, from Nottinghamshire and said to be from the same blood line as the Queen's own beloved dogs, donated the samples for the experiment.
The team at the newly opened Nanoscale and Microscale Research Centre in the School of Chemistry then etched the birthday wishes using a beam of gallium ions.
Dr Chris Parmenter, one of a group of scientists who hold the world record for creating the smallest test tube, used a Focused Ion Beam Scanning Electron Microscope, which can manipulate materials on what is known as the nanoscale.
The scientists had to work with a measure of nanometres, where one million nanometres is equivalent to just one millimetre.
One human hair is 80,000 nanometres wide.
The official British Monarchy Twitter feed said: "One of the more unique tributes to The Queen today!"
