Shia and Sunni have mostly same beliefs and both believe infundamental beliefs of Islam. Today there is up to 260 sects inIslam that are in two main categories of shia and sunni.Shia believes in Allah, prophet and all fundamentals ofIslam.Shia pray 5 times a day but usually do the 2, 3 and 4, 5 praytogether and so may seem they do only 3 pray a day. there is somedifferences in details of pray like genuflect (for shia should beon a stone or part of earth and for sunni on carpet or floor ).shia believe after death of prophet God selected the successivefor prophet who is the political leader of Muslim community andpeople can not and does not the right to selected it.Shia believes the Caliph (Representative of God in earth) isselected only by God and can not be selected by people because Godsaid in Koran: "Indeed, I will make upon the earth a successiveauthority" (Quran 2:30) or "O David! We did indeed make thee avicegerent on earth" (Quran 38:26) also other verses.Shia believes such verses means only God can select an Islamicpolitical leader (Caliph).In Shia Islam Caliphs after prophet are 12 Imams and all of themare the same and have no mistake and have the knowledge ofeverything (not absolute knowledge like knowledge of God) and theyhear all sayings and even thinks of all humans after even aftertheir death by permission of God and they are intermediates betweenGod and human Shia Muslims always support them and forgive theirlives for them.Shia Muslims do not consider selection of Abubakr as Caliph bypeople valid because God did not select him. They believe Godordered prophet to declare people that Ali is selected as successorof prophet and prophet did this mission many times during hisprophet-hood and mainly in Ghadir event after last Hajj of his lifeat a 3-4 hour speech in front of 120,000 Muslims at Ghadir in hotdesert after 2 days stop of long caravan for gathering and 3 daysafter speech for congratulations and homage of Muslims to Ali.Islam at that time had high power in world and Some companions hadhigh interest in leadership position after prophet. Muslims knewthat it is the final Hajj of prophet (predicted by prophet) andwere going along with prophet to hear what prophet says at end ofhis life. Shia believes Ghadir event is the most important event ofIslam and is mentioned in Koran in many verses like "Today" (اليوم)in verse 5:3 of Quran is the day of Ghadir. Or Verse 5:67 (OMessenger! proclaim the (message) which hath been sent to thee fromthy ****. If thou didst not, thou wouldst not have fulfilled andproclaimed His mission. And Allah will defend thee from men (whomean mischief). For Allah guideth not those who reject Faith) isrevealed at Ghadir day and is about declaring political leadershipof Ali after prophet.Both Sunni and Shia Muslims accept happening of Ghadir event Butdifferent interpret. Some Sunni writers tried to reject the eventof Ghadir as declare of leadership of Ali and said at Ghadirprophet only wanted to say Ali is my friend and no one shouldbother him. Ali had 3 different missions to Yemen by prophet during10 years and in 2 of them some companions of prophet had someconflicts with Ali and and prophet said some sayings about Ali tosolve conflicts and some sunni writers have mixed stories ofmissions of Ali to Yemen with story of Ghadir to prove Ghadir eventis not about Leadership of Ali and is not important.Shia scholars believe some Sunni writers have changed anddeviated historical evidences about political leadership of Ali inold historical books and republished them to destroy evidences ofleadership of Ali from old Sunni books.The famous Shia book Al-Ghadir (الغدير) by Allameh Amini is acollection of evidences and proofs for Ghadir Events written afterreferring to 100,000 Sunni books and full reading of 10,000 sunnybooks. Allameh Amini is a famous Shia scholar and spent 40 years ofhis life in travelling to access original old Sunni books inlibraries in different countries to write this 20 volume book onlyfrom Sunni books and not using any Shia book. Some Sunni scholarstried to reply this book but then said if we want to reply thisbook we should first destroy all books of ourselves.Shia doctrine have root in Karbala tragedy. When tragedy ofKarbala happened most of Iranians understood there is two differentkinds of Islam and after happening of Karbala tragedy most ofIranians became followers of "Ahl al-Bayt" and forgive their livesfor them like what they did in Iranian Revolution and Iran-IraqWar. Shia Muslims have at least 120,000 Hadith (saying) from TheFourteen Infallibles that is the base of Shia Islam along withQuran. Shia believes according to " Hadith of the two weightythings" The Fourteen Infallibles are the only valid interpreters ofQuran and sayings of them are from God because they areRepresentative of God in earth and they do not say anything fromthemselves. Shia believes 12th of them (Mahdi) is alive and becausepeople have killed all 11 Imams before him, he is in hide likeJesus and will come out of hide toghether with Jesus when peoplebecome ready and want to accept his leadership. All 11 Imams havebeen killed and during their life thy all have been in prison orunder hard control of government to not have any political action.They never had enough serious followers to can get political power.Among them only the sixth Imam Ja'far al-Sadiq was relatively freein his life to have only scientific activities (but banned from anypolitical action) and so only he is known in west because heestablished university and had students from all over the world.Westerns know him as a polymath: an astronomer, alchemist, Imam,Islamic scholar, Islamic theologian, writer, philosopher,physician, physicist and scientist. He was also the teacher of thefamous chemist, Jābir ibn Hayyān (Geber), and of Abū Ḥanīfa, thefounder of the Hanafi school of Sunni Islamic jurisprudence. Henever wanted be a famous man and only shared his knowledge with whowanted to learn. Some researchers consider his teachings the rootcause of renaissance.Sunni Muslims also accept Mahdi and his worldwide leadership asCaliph of God in earth at end of world. There is a famous Hadithfrom prophet Muhammad (PBUH) that Mahdi at hide is like sun behindcloud, he is hidden from people but people receive his benefits.Shia Muslims say some faithful believers have connection with Mahdiand use his knowledge. Shia Muslims believe that it is proved atleast 1000 persons have had connection and talk with Mahdi duringhis hide period but Any one having relation with Mahdi keep it anddoes not declare it in public until is alive.the conflict of shia and sunni has been always amplified byworld Imperialism to prevent Islam from gaining power.