Why do we experienced cloud like smoke near our mouth while speak during the winter season?

Why does smoke like vapour come out of our mouth in winter?

Why do we wear apron during cooking or working near the fire ?

Why do we pass more urine in wet and cold season?

Why should not we store spirit or petrol near our living place?

Why do people in our country decorate their cattle during festivals?

Why do we salivate during a nap of day time ?

Why do we conduct Mohl's half leaf experiment in our school lab ?

Why do old people shiver more in winter when compared to youngsters? Is there any special arrangement to prevent the escape of heat energy during winter?

Revanth blew air from his mouth onto the mirror while he was getting ready to go to school. He observed that the image in the mirror was not clear. Why do you think it has become so?