Humpback Whales Are Blowing ‘Bubble Rings’ at Boats. Are They Trying to Communicate? Researchers bring a SETI approach to the question of what—if anything—humpbacks’ underwater smoke rings might be trying to “say” By Melissa Hobson edited by Sarah Lewin Frasier A humpback whale known as Kараул (Watchtower) produced this bubble ring in Hawaii in 2020.…