UMary Allen
Ulusu lilungu lomzimba, kwizilwanyana nasebantwini. Igubungela umphandle womzimba. Njengeqokobhe, lisikhusela ekwenzakaleni kunye neebhaktheriya. Inobunzima obungaphezulu kwalo naliphi na elinye ilungu. Kumntu omdala, iphantse ibe zi-square metres ezimbini ngobukhulu.
Ulusu lwethu lunesikhumba esincinci sangaphandle, esikwabizwa ngokuba yi-horny layer okanye i-epidermis. Yenziwe ngeeseli ezifileyo. Ngaphantsi kukho ulusu lwesikhumba, i-dermis. Kwidermis kukho imithambo-luvo kunye nemithambo yegazi. Iingcambu zeenwele kunye namadlala okubila kunye nesebum zikwakhona. I-sebum iqinisekisa ukuba ulusu alumile.
Eluswini ngaba iidayi ezincinci ezibizwa ngokuba zii-pigments? Abantu abanolusu oluntsundu banemibala emininzi. Xa ilanga likhanya eluswini, lenza ibala lebala elingakumbi. Oku kwenza ulusu lube mnyama kwaye lukhuseleke ngcono elangeni. Kwelinye icala, abantu abanebala elimhlophe batshiswa lilanga ngokulula. Abanye abantu nezilwanyana azinabala kwaphela. Ibizwa ngokuba yialbinism.