There are so many people who prefer to have holiday or vacation in their day off. Yup, having vacation or holiday is believed as the best way to refresh the mind after doing many activities. How about you? Do you like to go to some places in your holiday? I am sure you have some lists of great place...

It comes the time when you have the leisure time to spend for traveling. You have an idea to visit your relatives on the other town by using the train. Yet, sometimes we feel so bored and distressed finding out that our travel is still far to go. So, what can we do to overcome such kind of boring experience...

How does sound travel in solid materials? The transmission of sound can be illustrated by using a toy model consisting of an array of balls interconnected by springs. For real material the balls represent molecules and the springs represent the bonds between them. Sound passes through the model by...