One morning in January this year, marine scientist Terry Hughes opened X (formerly Twitter) and searched for tweets about the Great Barrier Reef."I keep an eye on what's being tweeted about the reef every day," Professor Hughes, a leading coral researcher at James Cook University, said.What he found that day surprised and confused him; hundreds of bot accounts tweeting the same strange message with slightly different wording."Wow, I had no idea that agricultural runoff could have such a devastat...