Can the past change? It sounds incredible, but scientists are debating exactly this, with various theories ranging from quantum mechanics to the many-worlds interpretation. If it could, how would it appear to us? The internet is buzzing with wild ideas, so it's time to go over where they originated, and consider in detail what exactly might be causing it.
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According to Ebay, about 500 listings spell it as Bam-Bam. When people write product listings, they believe or remember that most of the time the spelling is Bam-Bam.
https://www.ebay.com/sch/i.html?from=R40&_sacat=0&_nkw=bam+bam+flintstones&_pgn=11&_skc=500&rt=nc
On video, Unimundi points out that in one of the original story boards from Hanna Barbera, the content of the story board says Bam-Bam instead of Bamm-Bamm. (see video source below)
It seems on reddit there are also a few posts about this. https://www.reddit.com/r/Mandela_Effect/comments/7edz2v/mandela_effected_pebbles_bam_bam/?st=jhebnq6u&sh=b1b88d99
https://www.reddit.com/r/MandelaEffect/comments/52ccah/little_boy_on_the_flinstones_what_is_his_name/?st=jhec5oth&sh=3b3e0d84
Bamm-Bamm doesn't seem accurate. It seems like it used to be Bam-Bam and now it switched to Bamm-Bamm.
What's causing the Mandela effect? Are parallel universes at work? Are we merging with timelines that are much like our own, yet slightly different. Are there infinite realities? What if we merge with a universe that is much different that ours? Are people's memories being rewritten? Do some people come from other universes?
Unimundi video source: https://www.youtube.com/watch?v=CiqEC2ZFu8w