A tube that cylindrical and open at both ends can produce all harmonics

no harmonics

only even numbered harmonics

only odd numbered harmonics

the mass and the sacrifice are similar because jesus christ is the victim and priest in both. the mass is different from the sacrifice in that jesus died for the remission of sins and cannot be  sacrificed again during the mass.

i think in the future, they will get bigger, and more resistant to things like earthquakes. as a result of computer technology, i think the insides of buildings will have better security, and a lot more computer operated things.

just did the journal got a 100%