Nexus 4 smartphone comes with a bunch of Android widgets you can add to one of the screens. Let me show you how to add a widget to a screen and how to customize it.
X-rays are a form of invisible, high-frequency electromagnetic radiation. X-rays are very small and energetic. They are used in different branches of science.
The Iron Curtain symbolized the ideological conflict and physical boundary dividing Europe into two separate areas during Cold War. Iron Curtain divided countries in the capitalist West and the socialist countries of East.
