:This appears quite strange to me as well.  Why would a definition of madelbug compare "Bohr bug" and "heisenbug"?  §2 says that apparent chaotic behavior and real chaotic behavior looks the same.  This would imply it's hard to tell the difference between an madelbug and a heisenbug.  I believe it's a bug in the paragraph.  I've corrected it here, even though every Jargon File on the web has it Bohr bug.