Last seen in:
- Universal - Dec 21 2023
- L.A. Times Daily - Jul 5 2023
- L.A. Times Daily - May 21 2023
- USA Today - May 19 2023
- Universal - Nov 19 2020
- Wall Street Journal - Nov 18 2020 - Do the Splits
- Premier Sunday - King Feature Syndicate - Sep 20 2020
- Universal - Sep 8 2019
- New York Times - Oct 14 2018
- Universal - Mar 8 2016
Related Clues:
- Refrigerant ingredient
- Marsh gas
- Biofuel option
- Colorless, odorless alkane
- Marsh gas, mostly
- Colorless, odorless gas
- Dangerous buildup in a mine
- Gas in fuel mixtures
- Crude component
- A fuel gas
- A greenhouse gas
- Greenhouse gas
- Hydrocarbon with two carbons
- Swamp gas, essentially
- Firedamp, for the most part