What Summary - Information is physical As thermodynamics arose out of the attempt to understand the performance limits of steam engines, information and coding theory was out of the analysis of the limits of communications channel. Information entropy turns out to be closely related to a similar concept that arose in the earlier study of thermodynamics. That the mathematics of steam engines and modern communications devices should be so similar is one of those lovely accidents of nature.
Information is believed to be physical if the second law holds.
We still need to understand the connection between physical entropy and information,a nd between physics and computation. Remind that erasure makes entropy. So, don't suffer from amnesia.