The exhaust produced by ocean-going ships can contribute to our warming climate. Most ships burn fossil fuels, so they spew out atmosphere-warming compounds. But some of their contribution to global warming may be a result of lower emissions—not of carbon, but of sulfur.
One of the most famous symbiotic relationships in the animal kingdom is the clownfish and its anemone. Symbiosis is the close association between two different species where at least one benefits from the arrangement. Scientists have long known the advantages clownfish and anemones offer one another, but one mystery has stumped them for a century: How do clownfish avoid getting stung by the nematocysts, or stinging cells, on an anemone’s tentacles, which it uses to catch its prey?
