Umzobi weemaphu kunye nomfundi weHarvard UBill Rankin beyile ezi mephu zinika umdla, ezibonisa isimbuku sabo bonke abantu abahlala kwinqanaba ngalinye lobubanzi okanye iside kwibala lika-2000. Njengoko ubona ngasentla, kukho umkhethe ongasentla: Ngokuka-Rankin, malunga neepesenti ezingama-88 zabemi behlabathi bahlala eMantla. Ikhweyitha, elinesiqingatha esenyakatho sama-27 degrees ngasentla.
I-Rankin: Ukuthatha ii-hemispheres zasemantla kunye nezasezantsi kunye, ngokomyinge wabantu behlabathi bahlala kwiidigri ezingama-24 ukusuka kwiikhweyitha.
( UBill Rankin nge UPaul Kedrosky nge @iamfanlalisa )
