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EWD almost certainly wrote these on transparent film, because he gave his lectures on overhead projectors. Such film allows easy correction of mistakes because
by dreamcompiler 7y ago
EWD almost certainly wrote these on transparent film, because he gave his lectures on overhead projectors. Such film allows easy correction of mistakes because overhead projector markers are water-soluble.
- carapace 7y agoAh! Now that you mention it I see what you mean. Whew! That must be it. Thanks!