Photo: President Jonathan kneels before late Pres. Yar'Adua's mum in Kastina state.

President Jonathan who is currently in Katsina State on a 2-day working visit, went to pay a courtesy visit on Hajia Aya Dada, the mother of his late boss, President Umaru Yar'Adua.
He showed her great respect by kneeling before her to greet her. That is called humility..