[ddots-l] sonar demonstrations

i guess everybody here know these demonstrations 
that are available on youtube.com .
if not here are some links.
http://www.youtube.com/watch?v=o1j1Pc2h8A8

http://www.youtube.com/watch?v=cODQPV3FSDE

http://www.youtube.com/watch?v=t71Gr_d42iE

http://www.youtube.com/watch?v=ni27IFicYRo

http://www.youtube.com/watch?v=3PjqSc6s79Y
http://www.youtube.com/watch?v=3DkzhXGzoIU

http://www.youtube.com/watch?v=HLBRyiEaF7s

http://www.youtube.com/watch?v=9JeCxGOo5yc

http://www.youtube.com/watch?v=bpDST_Nk6N0

http://www.youtube.com/watch?v=qUExdsmNNrE

http://www.youtube.com/watch?v=qyIiTFSY-YY
http://www.youtube.com/watch?v=WqdAAABzi7c

even though these are videos i think they are pretty good explanations.

Luis

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