Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Nhevedzano yechipiri isingaperi yakawanikwa muEurope, naJohn Wallis muna 1655, yakanga iriwo chigadzirwa chisingaperi:  Mubvunzo: Mugore ripi John Wallis akawana nhevedzano yechipiri isingaperi?
Nhamba 1655