org. ♪ and now we unleash it onwerful your taxes.pecies has created. hello my name is watson. yep. h&r. come see us and get your taxes won. >>> this museum in waterford, ireland, claims to hold a piece of the actual cross that crucified jesus. the true cross, a relic said to have been discovered by the empress helena 300 years after christ's death. 800 years after that, the pope would give this piece of it to the king of ireland. >> when the pope gives you a relic of the true cross, he's almost saying, you know, you're a real king. you've got that legitimacy. you've got that power. >> for the first time in history, a prized relic of the true cross will be carbon dated. professor tom higham has over 20 years' experience. >> there's quite a lot of what looks like lacquer that's across the top of the wood. and lacquer will have a different radial carbon concentration, probably to the age of the wood. but unfortunately pieces of the material have been taken, and that exposes the actual wood. so that's a good place for us to take the sample from. >> the procedure should leave little percept