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ultra sounds are used for seeing a baby in an ultra sound
It's all around you, starting with equation of diffusion and ending with equation of propagation of sound and EM waves.
ahhh well if there was no such thing as sound waves everyone would ahh be deaf!
64= the daily numbers we use LXIV=50[L]+10[X]+(5[V]-1[I]). lol might sound confusing but hope it helped... :) ;
daily life use in geomatry