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Sound travels at about 760 miles per hour, or 340 meters per second and about 661 knots on an average day at sea level....

Get immersed in a volcanic landscape with bubbling lava, spewing eruptions, and colliding rivers of fire.(from National Geographic videos)

One of our most innovative, popular thinkers takes on-in exhilarating style-one of our key questions: Where do good ideas come from? With Where Good Ideas...

Underwater Hunter Goes Deep Sea Fishing Without Air. BBC Video.

Never Give Up – No Arms – No Legs – No Worries Nicholas James Vujicic (born 4 December 1982) is an Australian preacher and motivational...