As Florida fights a dengue outbreak, a ballot proposal to cut property taxes has raised concerns about local governments’ ability to pay for sufficient mosquito control.

© Zack Wittman for The New York Times

Using sensors developed for self-driving cars, a Chinese start-up claims it can track and destroy tiny flying targets while avoiding people, pets and reflective surfaces.

© Qilai Shen for The New York Times

Using sensors developed for self-driving cars, a Chinese start-up claims it can track and destroy tiny flying targets while avoiding people, pets and reflective surfaces.

© Qilai Shen for The New York Times