Darla was struggling to solve a difficult problem so she took a break to have lunch. As she was having lunch the solution to the problem came to her even though she was not actively thinking about it. This illustrates

Incubation effect

Explanation: Incubation effect is one of the steps of being creative. It refers to how our unconscious thoughts process can come all together and be invented in our conscious work which will breed novel ideas at a certain time.

Incubation is driven by our intuition and insight such that our unconscious thoughts become verified by our insights. Incubation enhances our problem solving skills.

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.