Rubbish. Curriculum is indeed Latin, but it is neuter. The ending "-um" indicates singular. If plural, the ending is "-a". Think of gymnasium - that is one gym, and more than one gym is gymnasia. Also data is plural, and datum is singular. I suspect that all of you do not know that there were three kinds of gender: masculine, feminine, and neuter. Data, gymnasium and curriculum are all neuter nouns.