Interest
Proportion of Hacker News items mentioning "coral" over time.
Mentions
Total number of Hacker News items mentioning "coral" over time.
Corals are colonial marine invertebrates within the subphylum Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. Read more on Wikipedia