Hacker News on 3 March 2020

• SETI@home shuts down after 21 years
• What's so hard about PDF text extraction?
• Simple Systems Have Less Downtime
• Introduction to D3
• Reddit has become a guide to personal finance
• What are the mysterious light sources on light pollution maps?
• Fed cuts half point in emergency move amid spreading virus
• Revoking certain certificates on March 4
• Mastercard investing in technology to identify commuters by gait, heartbeat
• The sound of the Hagia Sophia, more than 500 years ago