We live in a world of continuing technological development. Modern man has made large architectural constructions, fast transportation means and instant communications, electronic and space technology, medical & pharmaceutical research, warmth clothing, wealth and goods' mass production, and last but not least, fortunately or unfortunately, powerful weapons that can shake the earth and even destroy the aforementioned achievements.
But still, it seems that Nature, the planetary system and its forces (its forces of movement, of change, of reaction) have a powerful role, and oftenly a destructive, in the life of modern man and his societies.
Here's a demonstration of such a power, and unfortunately of a huge destructive power, the recent natural disaster in Oklahoma city.