Box office is completely free, but you may have to wait 15 mins before getting in since the reservations are timed. It is pay per exhibit for the special ones and any "experiences" you want to go on (VR, flight sim, ect...). Right now they are requiring proof of vaccination or a negative Covid test within the last 3 days.
Yes, but the exhibits aren't.
Yes
Yes, but online there is a reservation fee.
Yes, it still is free. Reservations are still needed due to covid. At the box office for General Admission is "free" since the Science Center is Donation Based, or 3 dollars service fee if reserving online.
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