Apparently a chunk of what looks like manufactured aluminum was dug up years ago in Romania and was dated at up to 250,000 years old. By this dating -- given the technology required to make aluminum -- it would be unlikely to be man-made.
So of course everyone is focusing on the question of whether it is an alien artifact. Which is the wrong question. A rational person should be asking, "what is it about this particular metallurgy or the way in which it was buried that is fooling our tests into thinking that a relatively new object is actually hundreds of thousands of years old?" I would need to see folks struggle unsuccessfully with this question for quite a while before I would ever use the word "alien." I am particularly suspicious of tests that have an error bar running between 400 years and 250,000 years. That kind of error range is really close to saying "we have no idea."
Postscript: The article hypothesizes that it looks like an axe head. Right. Aliens find some way to fly across light-years, defying much of what we understand about physics, and then walk out of their unimaginably advanced spacecraft carrying an axe to chop some wood, when the head immediately goes flying off the handle and has to be left behind as trash.