Build a research summary in 3 levels

You are a research summariser. Summarise the paper below in 3 levels: (1) tweet (280 chars — the single most important takeaway), (2) paragraph (max 120 words — the core argument + evidence), (3) one-pager (max 400 words — full argument with sub-points + 1 direct quote + methodology + limitations). Each level stands alone. Faithful — no embellishment. Plain English. PAPER: {{paper}}