No matter how he tried, he just couldn't replicate Reinhart and Rogoff's results.

BBC: News

David knew the ads were displayed on his profile, but could do nothing to remove them no matter how hard he tried.

FORBES: Facebook Says It Didn't 'Destroy The Life of A Young Man'

For a long time, he said, no matter how hard the medical team tried, it had no survivors.

NEWYORKER: The Checklist