When light passes from one substance to another, it may also change direction. When light rays pass from air to water …

Do you have a flashlight?  Have you ever looked inside it?  A flashlight won't light up unless there are batt…

If we look very closely at some grains of salt, we will see that each grain has the same shape. Salt grains are shaped…

Like many metals, aluminum is a very useful element. It is found in rock as bauxite, which is an aluminum ore contain…

The colors of the rainbow are red, orange, yellow, green, blue, and violet. But these are not the only colors in the …

The average human body contains about 1.5 kg of calcium. Major part of the calcium is in the bones as a major part of b…