The Museum of the Bible is not a place of teaching and/or worship. It is a "pay to see" MUSEUM showcasing the history of the Bible in various cultures throughout time. Aside from the entry fee, it is no different than visiting the Smithsonian museums that are in the same area. Therefore, whether or not the museum is operating on the Sabbath is irrelevant.
The seventh day is Saturday. Sunday is the first day of the week, so being opened on Sunday isn't breaking God's commandments.
Because they understand that there aren't many days when people have large blocks of time to learn about God from their display and they want to make it accessible. Getting access to craft products on Sunday, while handy, isn't serving God in the same way.
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