Student of chemestry: A kiss is a reaction of interaction between two hearts. Student of physics: A kiss is a cotraction of mouth due to the expansion of heart. Student of zoology: A kiss is a interchange of unisexual salivary bacteria. Student of Alzebra: A kiss is one plus one equal to the one divided by nothing. Student of Geometry: A kiss is a shortest distance between two lips. Student of Economics: A kiss is that thing for which demand is higher than supply. Student of Account: A kiss is a credit because it is profitable when return. Student of of Electricity: A kiss is a direct current provided without any external supply. Student of Statistics: A kiss is an even probability of which depends upon the vital statistics 36-24-36.