SUMMER,WINTER AND SWEATER

Earth not only revolves around the sun but also tilts to one side or other every 6 months. This tilting causes seasons. The hemisphere which faces the sun is experiencing summer. The other hemisphere which is away from the sun is having winter.

In summer, we want to cool our body. Hence we use high speed fans which blow away hot air surrounding the body and brings in cool air. In winter, we want to keep our body warm. We wear woolen sweaters. The hairy wool material traps warm air. The air cannot easily escape from our body and hence keeps the body warm.

The earth is at right distance from the sun. Hence it has the right temperature, not too cold or too hot. The temperature keeps water in liquid form and sustain the life.

Science update: MIT researchers made micro lenses with droplets.

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