Experts are still trying unravel the secrets of the mind.
Mind bending tests that are having these people scratching their heads.
Images from the new episodes of Alaska State Troopers.
The Human Stash
Captured moments of man and dog in training situations.
Metal detectors, exploring and digging all add up to a good old time for these guys.
See photos of the border security officers in action
Animated Images from the Known Universe
In the animal kingdom, there's no shortage of bizarre behaviour. Take a look at some real freaky images of some weird and wonde...
At JFK International Airport in NYC, officers encounter extreme smuggling cases.
Wild Russia Arctic
Wild Russia The Great Divide
Wild Russia Kamchatka
Wild Russia Siberia
Wild Russia The Secret Forest
Wild Russia Primeval Valleys
See images from the Blowdown series on National Geographic Channel.
Just how big was the biggest dinosaur ever to walk the face of the earth?
Images from the heart of the greatest river basin in the world.