Scientists can determine ancient atmospheric concentrations by measuring CO2 and methane levels in tiny air bubbles trapped in such ice, formed when the ice fell to the earth as snow. (scientificamerican.com)
Most of the babies who drink formula milk or pumped breast milk from bottles suffer from colic (gas) due to ingestion of air bubbles in the bottle. (electricbreastpumpwomen.com)
When all circles have been filled in, rap the baking sheet hard on the counter to remove air bubbles. (theredheadbaker.com)