Notes concerning “Sparks”

• Marking metal surfaces with arcs 2016-10-06 (4 minutes)
• Compressed sensing microscope 2016-10-06 (7 minutes)
• Spark particulate sieve 2016-10-06 (updated 2016-10-11) (7 minutes)
• Data archival on gold leaf or Mylar with DVD-writer lasers or sparks 2018-04-27 (5 minutes)