constantinople, that's several centuries before the radiocarbon dates. and there are fold marks on this cloth that dovetail very nicely when you reconstruct this with what is reported to us in constantinople. so for me, that's a pretty compelling reason to take a serious look at the radiocarbon date. >> thank you, dr. john jackson. it's great to talk to you. i cannot wait for this, because to me this is the ultimate mystery. it airs sunday night at 9:00. watch it right here on cnn. i want to welcome our viewers here in the united states and around the world. we have just learned some distressing news, sad news. leonard nemoi known for his character dr. spock on "star trek" has died at the age of 83.