The UV Index provides a daily and hourly forecast of the expected intensity of ultraviolet (UV) radiation from the sun. Some exposure to sunlight is enjoyable. However, too much sun can be dangerous. Overexposure to the sun's ultraviolet radiation can cause immediate damage, such as sunburn, and long-term problems, such as skin cancer and cataracts.
All polls are surveys based on samples drawn from parent populations. A poll's purpose is to make accurate inferences about that population from what is directly learned about the sample through questions the sampled persons answer. Knowledge of the sample is just a means to that end.
Push refers to a system in which data is pushed to a user's device rather than pulled by the user. In other words, the data transfer is initiated by the server rather than the client. Push technology, which is also called server push, can be used to send news data, stock updates, and other information from the Internet to a user's computer. It is also used to send text messages via SMS to people's cell phones.