Just be thankful a physicist with a few hundred dollars to waste hasn't done a UFO or cropcircle hoax...
I drew up plans for a UFO hoax that would DEFINITELY be more impressive than any of the ones that have made the news- the cost would have been a few hundred dollars- mostly for the helium... it would have lights, a massive radar return and a little laser show...
And then imagine what news it would make if alien 'artifacts' were found in a cropcircle with isotope ratios totally different than what is found on earth naturally... Thats only a little more expensive but easily done....
