Under the conditions of less rainy days during the blooming period, the temperature is the main factor influencing the reproductive rate, then is the duration of day and the velocity of wind.

The studies -- in which parents were asked about day care and playgroup attendance -- varied when it came to the timing, duration and extent of social interaction with other children, the researchers.

What was found is that when people are exposed to a certain level of noise every day for a certain duration, they're going to have a certain degree of hearing loss on average.