3 Nephi 2

 I find it interesting that shortly after the great sign of a day, a night, and a day of no darkness - 

"...the people began to forget those signs and wonders which they had heard, and began to be less and less astonished at a sign or a wonder from heaven, insomuch that they began to be hard in their hearts, and blind in their minds, and began to disbelieve all which they had heard and seen—

2 Imagining up some vain thing in their hearts, that it was wrought by men and by the power of the devil, to lead away and deceive the hearts of the people; and thus did Satan get possession of the hearts of the people again, insomuch that he did blind their eyes and lead them away to believe that the doctrine of Christ was a foolish and a vain thing."  (3 Nephi 2:1–2)

Even with clear evidence in our day, the people fail to remember.