Children, even those that are vaccinated, may develop rotavirus disease more than once. That is because neither natural infection with rotavirus nor rotavirus vaccination provides full immunity (protection) from future infections. Usually a personâs first infection with rotavirus causes the most severe symptoms.
Because molecules move quicker at higher temperature, causing them to collides more. Since they collides more, reaction occurs to be a lot faster to. And that's why things dissolve quicker in hot water than in room temperature water.
Scientists aren't completely certain why hot water sometimes freezes more quickly than cold water. The Mpemba Effect is not always seen -- often cold water freezes before hot water. The explanation for the effect likely has to do with impurities in the water, which serve as nucleation sites for freezing. Other factors may include: an effect from the evaporation of hot water. increased convection in hot water.