In the 50s and 60s there was high powered missiles that was fired at the firnament to try and penatrate it. They were unsuccessful but that doesn't mean they give up. In researching the Mandela Effect I have come across evidence that they could be weakening the firmament and this cannot be ignored so this need has many people looking into it to try and find the truth.
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https://www.youtube.com/watch?v=GCBV7IxbdJg