Only 1, you cannot take pictures of Emmett Till Casket. Out of Respect for the family.
Agreed. There were plenty of kids running around with schools and other parents. I even vlogged from there and other Smithsonian museums without issue.
I'm not sure of all rules and regulations, but I'm sure if you're a well mannered person you have nothing to worry about.
They have a security check point. The rest is easy-peazy. The main thing is deciding what exhibit you will visit first. The Museum is always crowded.
It is a museum just like all of the other museums in Washington DC or Rome or Moscow
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