知识世界

History:The X Rays

In 1895， the German physical scientist Roentgen found a kind of rays by accident. It was a new and previously unknown radiation. He named it X rays. The X rays has a wide range of uses applied by many areas. It can be used for medical and customs examinations， and also for art issues.

• 01

  History： Secrets of the Anasazi

  
• 02

  History： Alfred Nobel and Dynamite

  
• 03

  History： What The Ancients Did for Us — The Greeks

  
• 04

  History： Mysterious Places — Chartres France

  
• 05

  History： Seven Wonders of Ancient Rome

  
• 06

  History： The Egyptians

  
• 07

  History： Planck and Quantum Physics

  
• 08

  History： Mysterious Places — Pompeii Italy

  
• 09

  History： Transportation Achievements

  
• 10

  History： Poisoned