A large colony lives in the Antarctic in a network of bases. They have so far evaded the dreadful worldwide plague.
When they venture outside their base they don their climate-proof clothing and their goggles. These goggles have liquid lenses.
Transmissive liquid lenses use two immiscible fluids, each with a different refractive index, to create variable-focus lenses... The two fluids, one an electrically conducting aqueous solution and one a nonconducting oil, are contained in a short tube with transparent end caps... The shape of the lens is adjusted by applying a dc voltage... http://www.smartalix.com/liquidlens.html
The colonists use beer as one of the immiscible liquids in their goggles. Why is this?