This is an essay on tidal friction and ocean mixing. Tides are not a subject at the forefront of current interest. Many oceanographers believe the subject died with Victorian mathematicians. But TOPEX/POSEIDON (T/P) altimetry measurements have suggested an enhanced lunar role in ocean processes and put a new face on an ancient subject. In contrast, oceanic mixing is alive (even fashionable); we wish to convince the reader that the connection between these ancient subjects is deep, important, and not obviously lunatic.