Young-Jae Lee, Chae-Jin Na, Liu Botao, Ki-Hyun Kim, Youn-Suk Son, Quantitative insights into major constituents contained in or released by electronic cigarettes: Propylene glycol, vegetable glycerin, and nicotine, Science of The Total Environment, Volume 703, 2020, 134567, ISSN 0048-9697, National Center for Biotechnology Information (US)
Archived from the original on November 27, 2017
Standard Wrapper The Wrapper has been well-proven in many different and demanding production environments
House Sparrows and House Finches have learned to adapt to the littered landscape, incorporating filters into their nests to help ward off parasites
Swedish enterprise Corvid Cleaning is testing a reward-based system where crows picking up cigarette butts and drop them into a trash can