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Why Do Casinos Pump Oxygen Through Their HVAC Systems?

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Is it true that casinos pump oxygen to keep players alert, and if so, why?

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Yes, some casinos pump oxygen through their HVAC systems to keep players feeling refreshed and alert, even if they haven't slept for hours. The increased oxygen levels can help gamblers stay awake and continue playing longer, which could lead to more spending at the casino.
Question2Answer fatal error:

Reading one value from empty results

Stack trace:

require() in index.php:27
require() in qa-index.php:189
qa_output_content() in qa-page.php:53
html() in page.php:359
body() in qa-theme-base.php:271
body_content() in qa-theme-base.php:391
main() in qa-theme.php:264
main_parts() in qa-theme-base.php:727
main_parts() in qa-base.php(720) : eval()'d code:51
main_part() in qa-theme-base.php:836
a_list() in qa-theme-base.php:882
a_list_items() in qa-theme-base.php:2282
a_list_item() in qa-theme-base.php:2290
a_item_main() in qa-theme-base.php:2311
a_item_content() in qa-theme.php:554
getVideoIdFromDb() in qa-base.php(720) : eval()'d code:42
qa_db_read_one_value() in qa-base.php(720) : eval()'d code:73