Regarding communion, I guess I learn new things everyday. No idea Catholics believed that. I was raised Catholic on my mother's side, and Armenian Orthodox on my father's side. I teach at a Catholic school too. Now to find out what my Orthodox side believes. I've somehow gravitated more towards them for reasons unbeknownst to me.
Good thing I was never given a Catholic entrance exam at my job. I respect the belief. Doesn't mean I agree with it. Then again, I interpret most things (religious and not) as intent/symbolic rather than literal.
Orthodox churches also teach communion is the literal body and blood. Catholics and Orthodox Christians can take communion at each other's churches if there is no church of their own faith available to them. In practice communion is a little different in that in Orthodox Churches leavened bread is used (because Christ is risen) and it is mixed with the wine and put into the person's mouth with a spoon.
The schism between the Roman Catholic Church and The Eastern Orthodox Catholic Church (the technical name) was in 1054 and had less to with a difference in theology then a disagreement about the supremacy of the Bishop of Rome (the Pope) and whether he should be regarded as superior to other bishops. There are some theological differences (Orthodox churches don't teach that Purgatory exists) and practical differences (Orthodox Priests can marry) but generally Orthodox Churches and the Roman Catholic Church are much closer in their teachings then either is to Protestant Churches.