To disturb or not to disturb sign

The panda house at the Smithsonian National Zoological Park in Washington D.C. is truly amazing. A glass wall lets the visitor see the control room where researchers monitor and study the bears 24/7. When research is in progress, a notice on the window alerts the visitors on the appropriate behaviour to have. Or does it?

The panda house at the Smithsonian National Zoological Park in Washington D.C
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