Step-by-step reasoning process: Childhood amnesia is common, with most adults not remembering their lives before 2 or 3 years of age. 9/11 occurred in 2001. Students graduating high-school in 2017 would have been born in 1999.
[Q and A]: Would a student of the class of 2017 have amnesia about 9/11?
yes

Step-by-step reasoning process: When originally built, the Great Pyramids had a thin surface of limestone covering the bricks, making them shine in the sun. Over the centuries, the limestone layer has been removed by thieves and erosion, exposing the more common stone bricks underneath.
[Q and A]: Do the Egyptian pyramids look the same from outside as they did when new?
no

Step-by-step reasoning process: In 1986, the space shuttle Challenger exploded during launch, killing all astronauts aboard. In 2003, the space shuttle Columbia also exploded, again killing its entire crew. Various other space flights have resulted in fatal disasters.
[Q and A]:
Has every astronaut survived their space journey?
no