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The BBC still broadcasts Radio 4 on long wave as well as on digital radio, FM, and online.

Indigenous women and police clashed in Lima, Peru on Saturday in the latest in a long wave of protests calling for the resignation of President Dina Boluarte.

Following a long wave of expropriations under late Venezuelan President Hugo Chavez and the default of bonds issued by PDVSA, the creditors flocked to U.S. courts to enforce arbitration awards against the country.

But it takes a detector light-years across to pick up these long waves.

The long wave of unrest has posed one of the strongest challenges to the Islamic Republic since the 1979 revolution.