Uma ungomunye walabo abathanda ukuhamba emasimini babheke izitshalo, kungenzeka ukuthi uqaphele ukuthi ezinye izitshalo zithanda lubhekilanga, bahlala bebheke ngaselangeni, befuna ukukhanya nemisebe yalo. Yize zingakwazi ukusuka phansi, emini zihambisa isiqu sazo ngokuya ngokuthi ikuphi inkanyezi enkulu yenkosi.
Ukwengeza ubhekilanga, ngokuqinisekile uqaphele ukuthi ezinye izitshalo zikhula ngendlela efanayo lapho ilanga liphuma khona, futhi emini zizama ukulandela ukukhanya okuqhamuka kule nkanyezi enkulu. Kodwa wake wazibuza kungani ezinye izitshalo zilandela indlela yelanga? Yize impendulo ingabonakala ilula, akunjalo neze. Omunye wabantu bokuqala ukubuza lokhu kwakunguLeonardo Da Vinci, futhi kulo mbuzo, abantu abaningi baqala ukubuza okufanayo.
Njengamanje, iqembu labaphenyi baseYurophu lenze okutholakele okusisondeza kancane empendulweni: ngokusobala izitshalo zine- tshala i-hormone ebizwa ngokuthi i-auxin, okubenza bafune ukukhanya kwelanga. Le hormone igcinwa ezindaweni ezithile esitshalweni, njengezingxenye ezikhulayo zesitshalo, bese iyiswa kwezinye izindawo, kufaka phakathi isiqu.
Ukuze isitshalo sikwazi ukufinyelela ukumunca imisebe yelanga ngokwanele nangokufaneleKubaluleke kakhulu ukuthi isiqu siqondiswe ngokushesha okukhulu ukuze sikwazi ukufinyelela phezulu kakhulu futhi sibambe imisebe yelanga. Kungalesi sizathu ukuthi inani elikhulu lale hormone i-auxin liqala ukulethwa endaweni engezansi yesitshalo, ngakho-ke isiqu siqala ukukhula siqonde. Ngale ndlela, izitshalo ziyakwazi ukusizakala kangcono ngezimo ezishintshayo zemvelo yazo.