(See last weeks story and others here.)

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On the plains of the oldest desert in the world,
the Namib, you may sometimes see strange grooves in the sand.
Some are straight, some curved.
Close together they run in parallel, further apart in different directions. Some even travel slightly uphill.
These are tracks made by moving rocks.
No one has ever seen them move, but the evidence is unmistakable.
In the United States in Death Valley similar rocks have been studied but no plausible explanation has been found.

In Namibia they still move unexplored and largely unknown.
In the photo above, please note the clear difference between the track made by the boulder to the left of it and a depression made by water behind.
Various sized rocks leave a similar track
Note the earth pushed up in front of the rock.
It must take considerable force to do this.
This one seems to be
reversing on it's track.
This rock is lying
outside it's track.
Note the grooves in the distance made by these two.
The smaller rock seems to be travelling back
to where it came from,
but in a slightly different direction,
making a new groove.

What makes these rocks move?
Wind? Mud? Water? Ice? Lay lines? Magnetism?

In our age of science and exploration,
this remains one of the few mysteries on earth!