0
WWV - radio station - was created in 1920.
N/A. There is and was no WWV
Opera is mostly 100% singing and operetta is roughly 70% sung and 30% spoken.
we can't compare the Opera and Google, it depends on what feature you want. if you compare in user friendly property then Google is better than opera.
But when you talking about features and look & view then Opera is better.
70 %