1. Freeform optics design Juan C. Minano, Pablo Benitez, Julio Chaves and Fabian Duerr 2. Attosecond pulses and laser-driven electron dynamics Michael Chini, John Beetar and Shima Gholam-Mirzaei 3. Quantum polarimetry Aaron Z. Goldberg 4. Young's interference experiment: Past, present, and future Greg Gbur and Taco D. Visser