What do you think about crop circles? I´ve read a lot about the ones in England and I think some at least are not human made, if they were that would be a great mystery as well, since we don´t know the technology to make those impresive things without being seen. To me it´s a mystery either way. Also I´ve seen videos explaining what the symbols may mean, one is a message encoded the same way as another one humans sent to space.