Isipiliyoni siqakatheke ukudlula umbono

Isayensi yingcenye ebhorako: isilinganiso esifanako, esibuyelelweko bekube kulapho sikhanya khona. Ukubukela sele kukulinga: isibonakude siveza ukukhanya okuneminyaka eyikulungwana. Kokuthoma kuza ukulawula, bese kuba yithabo: yenza into efanako ngaphandle kokuqakatheka. Buza "lokhu kwalinganiswa njani?"—umbuzo munye uqeda iindaba ezinengi ezikulu.