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Question: May 2012 Archives

When you photograph a person with a flash, you might get 'red eye' but if photograph your dog, you might get 'blue eye'. Why is that?

Human eyes dilate in dim light so the flash from the camera hits the retina, which is full of blood vessels and reflects red. Most dogs have a layer of crystals at the back of their eyes which reflect green or blue.

Why are eggs egg-shaped?

Eggs are smooth and tapered to allow the hen to push them out. The shape of eggs also prevents them from rolling, unlike a sphere.

Do refridgerators use more energy when they are empty or full?

Refridgerators use less energy when they are full, once the food is chilled, becuase less warm air can move in when you open the door.