I love conspiracy theories, they're both amusing and unsettling. Amusing in how insane they can be, and unsettling to realize people believe this crap.
These ones are okay, if a bit short. But I find fault with the "Cardiff Giant" being a scientific hoax. The statue was not accepted by most archeological experts, geologists, and paleontologists of the day but was embraced by several christian scholars and ministers as real. That whole bit about "giants roamed the earth..." part of the bible.
Since the giant wasn't made by a scientist (it was a tobacco dealer) and was not accepted by scientists, how then can it be called a scientific hoax?
Good point. I think a scientific hoax in one designed to fool people into believing a particular worldview, paradigm, or scientific theory. It does not necessarily have to target the scientific community, though it sometimes does.
Contrast with War of the Worlds which was designed to completely fuck up your mind, albeit temporarily.
The thing about the lost cosmonauts actually has more weight than this makes it sound. While the whole thing about audio recordings of dying astronauts has been proven as garbage (as were those same Italian's claims they had video footage of the moon), there actually is evidence that Russia may very well have been sending people into space up to three years before the Gagarin flight, and that most of them died due to the capsules having been poorly made.
Yeah, it's intriguing, until you consider that there's a ton of material from North Africa, Arabia, Byzantium, and China covering that period, and it aligns with the proper reckoning.