Instabilities play a central role in the physics of foams. Some that change the topology of a dry foam are
indicated by the laws promulgated by Plateau in his 1873 book. Their occurrence is less clearly
predictable in wet foams. Various other instabilities are related to gravitational loading and gas
compressibility. We gather up many examples as a guide to future research and identify problems that
remain, including what we call pre-emptive instabilities, which occur before they are expected on the
basis of Plateau's laws.
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