The non-trivial roots are harder to find. They are harder to find than the trivial roots. They don't have the same neat rules that say what they are. Even though they are hard to find, lots of non-trivial roots have been found. Remember that the value of the Riemann zeta function was a kind of number called a complex number. And remember that complex numbers have two parts. One of these parts is called the "real part". We noticed an interesting thing about the real part of the non-trivial roots. All the non-trivial roots we found have a real part that is the same number. This number is 1/2, which is a fraction. This takes us to Riemann's big question, which is about how big the real parts are. This question is the Riemann hypothesis. The question is "do all the non-trivial roots have real part 1/2?". We are still trying to find out if the answer is "yes" or "no".