Least-squares spectral analysis (current) Challenge–response spam filtering Generation time Forward Scatter Over-the-Horizon Radar System Nee Soon Group Representation Constituency Glenn Torpy Billiard tables Magnetoplasmadynamic thruster PTPS Piła Pebble Beach Concours d'Elegance Energy Management System Peter Robinson (speaker) John White (composer) Solar eclipse of July 22, 2009