On "thought provoking subject matter"

Grooved Spheres - An Interim Report Naturally occuring with 1 sphere actually having grooves. "the grooves could have been carved innocently
just as folkart and later mistakenly thought to have been
present when it was found"

Dropa Stones - See criticisms. I think this is simply hoax and wishful thinking

Ica Stones - Questionable . Proven that many stones where forged.

Antikythera Mechanism - Actually much [url=http://www.antikythera-mechanism.gr/]more informa...

On "thought provoking subject matter"

Grooved Spheres - An Interim Report Naturally occuring with 1 sphere actually having grooves. "the grooves could have been carved innocently
just as folkart and later mistakenly thought to have been
present when it was found"

Dropa Stones - See criticisms. I think this is simply hoax and wishful thinking

Ica Stones - Questionable . Proven that many stones where forged.

Antikythera Mechanism - Actually much more information has come to light on this object. While significantly advanced for its time, it is not impossibly unusual.

Bagdhad Battery - Another interesting artifact. Mythbusters produced an episode involving this. But as above, while unusual and fantastic, not impossible or beyond acceptance

Coso Artifact - A spark plug encased in a concretion composed of iron derived from the rusting spark plug. The claim of a 500,000 yr age has no reference or evidence to support how this number was achieved.

Ancient Model Aircraft - "Most Egyptologists think that the artifact is a bird with outstretched wings" Most likely this is simply imagination run wild. No other evidence is found to suggest that it is anything more than a model bird.

Giant Stone Balls - Again, imagination run wild. The process to make these, even by anceint people, is easily understood and easily duplicated.

Impossible Fossils - Exeptions to the norm, Around 200 strange fossils vs 250 million fossils t