Water containing suspended nanobubbles is utilized in many biological and medical applications. For example, nanobubbles increase the efficiency of drug and gene delivery. Water containing oxygen nanobubbles is used in wastewater treatment, to promote the growth of plants and animals, and as a cure for diseases caused by anaerobic bacteria. The observed lifetime of suspended nanobubbles is up to several weeks. However, according to the classical theory of bubble stability, a nanosized bubble should dissolve within microseconds. This controversy between experiments and theory is known as the nanobubble paradox.