Abstract: A self dosing skin composition and method releases sun blocking agent or other active ingredient onto the skin of a user as a function of exposure to at least one environmental condition over time. The environmental condition is preferably exposure to sun light, in particular, harmful UV radiation. The composition includes a medium adapted to be spread onto the skin of a user and a reservoir defining at least one wall for containing at least one sun blocking or other agent. The reservoir is dispersed in the medium and the wall is designed and/or selected to deteriorate over time with exposure to the environmental condition or conditions, for releasing the agent into the medium and onto the skin. At least one agent is provided in the reservoir.

Abstract: To differentiate between lightning strikes and tornado generated electromagnetic signals, a tornado detection system and method is made up of RF receiving circuits which receive signals at two frequencies, while implementing a time variable automated calibration and the use of special algorithms, to reliably detect tornado events and to signal an alarm. A network of such systems can be implemented, using a plurality of antennas which are capable of discerning a directional vector, and integrating the directional information from multiple units by effecting a triangulation calculation in a server terminal to determining a position and path of an approaching tornado.