Rubuta wani ɗan gajeren sakin layi na labari da aka ba da batun da ke gaba:  Mutum X yana nazarin gaskiya
Tabbas, ga ɗan gajeren sakin layi: Kafin 1879, mutane suna amfani da kyandirori da fitilu don gani a cikin duhu. A shekara ta 1879, Thomas Edison ya kirkiro kwararan fitila. Fitilar ta ba mutane damar gani a cikin duhu ba tare da kyandir ko fitilu ba.