diff -r 41d3aea3113d -r 0fbfb0a86fa8 handouts/ho08.tex
--- a/handouts/ho08.tex	Sat Jun 03 23:57:07 2017 +0100
+++ b/handouts/ho08.tex	Thu Jun 29 16:48:10 2017 +0100
@@ -38,6 +38,10 @@
 % contradictions and misunderstandings. Most of its problems are very
 % fixable, if you want to fix them
 
+
+% history of bitcoins
+% https://futurism.com/images/this-week-in-tech-jan-15-22-2016/
+
 \begin{document}
 \fnote{\copyright{} Christian Urban, 2014, 2015}