I hear what you're saying but when you check the picture, you see that the tips join perfectly, which is extremely unlikely to occur randomly, especially when t

I hear what you're saying but when you check the picture, you see that the tips join perfectly, which is extremely unlikely to occur randomly, especially when there seems to be more than one zigzags. [http://www.nature.com/polopoly_fs/7.22191.1417622702!/image/image1_900px.jpg http://www.nature.com/polopoly_fs/7.22191.1417622702!/image/...]