>Unironically posting ancient aliens. First video, guy finds small piece of metal with a metal detector. He's a geology professor, but doesn't go into the geology at all, just

"I've never seen anything like this in all my years" ∴ alien metallurgy maybe.

Second video: Are there desirable properties to an alloy of bismuth and magnesium? The 'expert metallurgist from New Jersey' didn't say, just that they didn't know of any way to make it. All that really proves is the limits of the knowledge of one metallurgist from New Jersey. There are any numbers of ways that metal might condensate in layers over time, all unlikely to naturally occur, but any far more likely than ancient aliens.

Third video: Guy literally admits that this is all pure speculation and that no definitive conclusions can be drawn from these random pieces of metal and that none of them are rule out all possibilities besides the existence of visitors with manufacturing technology beyond our comprehension.