In terms of indisputable evidence for aliens, this is one interesting branch. Unfortunately, it's a whole lot of nothing so far. 10 of 12 samples are hoaxes for sure, and 2 samples are interesting samples.

Notice the difference between this article and the hype surrounding the materials. This scientist says they can be made on earth, but doesn't understand why someone would want too.

The UFO crowd would have you believe these 2+ materials cannot be manufactured on earth.

The most obvious answer is some nerd collected some slag from a furnace and sent it to the UFO people as a joke.

This ALL hinged around the fact that supposedly, no one would WANT to manufacture these.

The totally different and not one solid mass of the same thing is the other dead giveaway that it's slag.

It's an interesting story but it's unlikely that there is any alien machine material on our planet. Interstellar distances are unimaginably vast and there is no technology that allows for travel to neighboring stars. Even if we found "material", it's still composed of elements that are the same for all locations in the cosmos. There are no special elements per se. Chemistry and nucleosynthesis is the same everywhere. I can't rule out unusual isotopes of elements, that is true. So it would be hard to say something came from another star system.

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this UFO stuff is a bunch of garbage