Cnidaria is a phylum within Kingdom Animalia which consists of hydras, jellies (or jellyfish), sea anemones, and corals. All cnidarians are radially symmetrical, and there are two main radially symmetrical body types.
The stock market crash, on black Tuesday (October 29, 1929) began the Great Depression.
China's government, regulators and financial institutions are now waging a concerted campaign to prop up the nation's stock markets â a move that failed spectacularly in the 1929 crash that triggered the Great Depression.