You can pay as much as you wish for general admission but for special exibits and imax you need to buy full price ticket
You pay as much as you want. It's a donation. yes you can use Id
Yes. $ to get in is up to you. In other words, its a donation. So, whatever you would like to give them.
There is a recommended fee to enter, but you can enter paying anything from 0 (nothing) up to the recommended amount.
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