Abstract: A physics package for an atomic clock is provided herein. The atomic clock may include a resonance cell storing alkali vapor having first and second hyperfine ground states and an excited state, a light source to transmit light through the resonance cell at a frequency corresponding to electronic decay from the excited state to the first ground state, and a photodetector to receive light from the light source. The physics package may include a laser, and controller circuitry to, at a first time, allow light from the laser to optically pump the alkali vapor from the first hyperfine ground state to the excited state; and at a second time, allow the photodetector to receive light source light from the resonance cell while inhibiting light from the laser from optically pumping the alkali vapor in the resonance cell.

Abstract: A water toy is disclosed herein. In one aspect, the water toy is comprised of a non-rigid material which has an injection molded main body and flap. This flap is integral with the main body and connected via a living hinge. The flap can be either in an open or closed position. When the flap is in the closed position, an inner chamber is defined and it is capable of containing enough air to enable the toy to float. When the flap is in the open position, access is provided to the inner chamber for cleaning or drying. Teething portions may also be provided in features of the water toy.