“-Your left lung is smaller than your right lung, to accommodate for your heart.
-70% of waste is eliminated through your lungs just by breathing2.
-Can you live without one lung? Yes you can, it limits your physical ability but doesn’t stop you from living a relatively normal life. Many people around the world live with just one lung.
-No matter how hard we exhale, our lungs will always retain 1 litre of air in the airways. This makes the lungs only human organs that can float on water.
-Oxygen only plays a small part in our breathing. The air we breathe contains 21% oxygen, but our bodies only use 5%, the rest is exhaled.
-Children and women are faster breathers than men because their breathing rate is higher.
-Humans exhale up to 17.5 millilitres of water per hour.”

Lung Foundation Australia (https://lungfoundation.com.au/lung-health/protecting-your-lungs/how-your-lungs-work/)