CriticMarkup is a way for authors and editors to track changes to documents in plain text. As with Markdown, small groups of distinctive characters allow you to highlight insertions, deletions, substitutions and comments, all without the overhead of heavy, proprietary office suites.

• NASA's Mars Climate Orbiter
• Ariane 5 Flight 501
• EDS Child Support System
• Soviet Gas Pipeline Explosion
• Bitcoin Hack, Mt. Gox
• Heathrow Terminal 5 Opening
• The Mariner 1 Spacecraft
• The Morris Worm
• Pentium FDIV bug
• Knight's $440 Million Error
• Honourable mention: NOAA-19 Satellite