Wind, humidity and rainfall combined precisely to create Monday's massive killer tornado in Oklahoma. The awesome amount of energy released dwarfed the power of the atomic bomb that leveled Hiroshima.

Space & Earth - Earth Sciences

May 21, 2013 3.8 / 5 (4) 3

Slovenian adventurer Matevz Lenarcic landed on Thursday in Western France after having overflown the North Pole in an ultra-light plane equipped to measure air pollution.

Space & Earth - Environment

May 23, 2013 5 / 5 (2) 0