If we know that meta-humans were created by the particle accelerator and testimony shows that a meta-human may have been involved in the murder of Barry Allen's mother 14 years ago it seems to me that way back then there must have been another particle accelerator.
Hiukkaskiihdytin loi metaihmiset. Metaihminen saattoi sotkeutua Barryn äidin murhaan. Silloin täytyi siis olla joku toinen hiukkaskiihdytin.