Oddly Wired
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memory

You only clearly remember the beginning and the end.

Information presented at the start and conclusion of a list is significantly better retained.

In a 1885 study, researchers found that memory performance follows a U-shaped curve. Items in the middle are frequently forgotten because they lack the distinct temporal advantage of being heard first or last. Your brain prioritizes the initial intake to build context and the final items as a closing priority.

The middle of any sequence is essentially invisible to your long-term memory.

Where this comes from

Study
Hermann Ebbinghaus, 1885
What the check found
Ebbinghaus's 1885 'Über das Gedächtnis' established the serial position effect, though the specific explanation regarding 'context' reflects modern interpretation rather than the original 19th-century text.
Confidence
Solid, with limits
memorycognitionserial position effect

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.