The iridescent ruby-red throat of an Anna’s Hummingbird, the stunningly bright blues and yellows of the (aptly-named) Blue-and-yellow Macaw . . . admit it, you get color envy every time you see a ...

Abstract: This paper is a brief tutorial on methods for using modulated signals in feedback loops, and especially of the different methods and trade offs used for demodulating those signals to get ...

Sidney Stevens is a writer and editor for magazines, websites, and books, with a focus on health and environmental issues. Some 400 billion birds share the planet with us, each with its own abundant ...