When a germ becomes penicillin-resistant , the germ has evolved. That event may not be very exciting, but it does meet the definition of evolution.
Any biologist can make a bacteria evolve in about a day or so.
A much-used example is the speckled moth. Then the Industrial Revolution put a lot of soot on Britain's trees. Being light colored was now dangerous to a moth that lived on tree trunks. Birds could see them too easily. By 1898, only 5 percent of the moths were gray.