Stokes waves
... that it took 120 years before it was discovered that deep-water Stokes waves, named after George Gabriel Stokes, are unstable?
... that it took 120<span id="mwCYU" typeof="mw:Entity"> </span>years before it was discovered that deep-water <b id="mwCYY"><a href="./Stokes_wave" id="mwCYc" rel="mw:WikiLink" title="Stokes wave">Stokes waves</a></b>, named after <a href="./Sir_George_Stokes,_1st_Baronet" id="mwCYg" rel="mw:WikiLink" title="Sir George Stokes, 1st Baronet">George Gabriel Stokes</a>, are <a href="./Modulational_instability" id="mwCYk" rel="mw:WikiLink" title="Modulational instability">unstable</a>?