How DO bacteria swim with no arms?

You had to skip breakfast today. To compound your misery, a delicious smell
permeates the office. Who ordered pizza? Your stomach growls. You wander around
the hallways and follow your nose to the source of the smell. A few boxes sit unat-
tended in the conference room. A sign in your boss’s handwriting threatens, “DO
NOT EAT.” You sneak a slice anyway, undetected. How do bacteria find food when
they are hungry?