Paulina Kuo is a physicist at the National Institute of Standards and Technology (NIST). While organizationally at NIST she may be a little hard to find, she is part of the Stanford laser-physics family tree (Fejer-Byer-Harris-Siegman). Her current research interests are in nonlinear optics involving single photons. She joins Dr. Charles W. Clark as a select member of NIST staff whose name can be spelled out with chemical symbols: Phosphorus Gold Lithium Sodium Potassium Uranium Oxygen.