In our universe, the neutrinos have more mass than all stars combined. Those tiny particles play a crucial role in the burning of the sun, explosion of the supernovae, and construction of the galaxies, and probably the existence of our universe. Only ten years ago, we knew so little about them that we had a crisis to explain why the sun shines. In the talk, I will present the results from the Sudbury Neutrino Observatory (SNO), which solve the solar neutrino problem. I will also present the effort of SNO+ to determine whether neutrinos are Majorana particles, which means they are their own antiparticles. Though the results from SNO and other experiments revealed many properties of neutrinos, there are still a lot of important questions about them. The neutrinos physics is at a very exciting stage because we may be able to answer all those questions within the next ten to twenty years.