The diamond poem, which is also called a diamante, is a relatively new form of poetry. Many credit Iris Tiedt with its development in the late 1960s.
The confusion may arise because of research that found a connection between carbonated cola drinks and low bone mineral density.. While artificially carbonated water is slightly more acidic than still water, it's not as acidic as sugary sodas, and does not seem to significantly damage tooth enamel.
When you drop the tablet in water, the acid and the baking soda react -- this produces the fizz. You can think of an Alka-Seltzer tablet as compressed baking powder with a little aspirin mixed in.