Congratulations to Dr. Ernst Fill. He has just celebrated his 80th birthday with his family. A surprise visit from the BIRD team came to his front door. The team brought a very special gift. A homemade cake. Its top side was decorated with an enhancement cavity with a thin taut foil as coupler, which is applied at a 45 degree angle. This arrangement was developed by Ernst Fill a few years ago. His invention is now not only very useful in infrared spectroscopy, but even a a culinary delicacy.