8 ارديبهشت 1387 10:35

The Southwest's current drought could be the start of the Dust Bowl-like future that some scientists have already predicted will come from human-caused warming

13 بهمن 1386 10:04

Water has some amazing properties. It is the only natural substance found in all three states -- solid, liquid and gas -- within the range of natural Earth temperatures. Its solid form is less dense than its liquid form, which is why ice floats. It can absorb a great deal of heat without getting hot,...