Abstract: The development of techniques to cool/slow and trap atoms and molecules brought about a revolution in atomic and molecular physics, with repercussions for physics at large. When slowed/cooled down, molecules become matter waves whose properties differ vastly from those of thermal matter. In particular, close to absolute zero temperature, the interaction range among molecules increases far beyond their dimensions, lending them strongly coveted collective and collisional properties. The latter are predicted to give rise to a novel ultracold chemistry. In the talk, I'll outline the main techniques of producing cold molecules, with emphasis on buffer-gas cooling and Stark deceleration. Subsequently, I'll review ongoing and anticipated experiments with cold molecules, including pioneering ventures concerning radiative lifetime measurements, reduction of transit time broadening, measurements of ultracold collisional cross sections, and finally testing of fundamental symmetries in nature, such as the time-reversal symmetry and parity.