Docents at the 9/11 museum in New York regularly find themselves having to correct misinformation about the attacks that people get online, particularly among people born after the attacks.

Docent Maryanne Braverman says it is part of the mission of the museum to educate people about the facts of that day.

She has been a resident of lower Manhattan since 1982. She was working in Tower 2 at the time of the attacks - she told all the co-workers in her office to evacuate and they all survived.

Braverman has been a docent at the museum since it opened in 2014.

She says a big takeaway from that day was the kindness and sacrifice of others.

Wednesday is the 23rd anniversary of 9/11, when 2,977 people were killed when al-Qaida hijackers crashed four jetliners into the Twin Towers, the Pentagon and a field in southwest Pennsylvania.