Bibliophilic

Though I'm following BibliOdyssey for almost a year now,  with every new post I'm still amazed by vast variety of subjects people wanted to write books about and how many of them became obsolete with invention of mass production,  (digital) photography and internet. 

From another book oriented blog BookNerd I found out about weird but fascinating online exhibition Making Visible Embryos, which shows how people imagined embryo would look like and how it was used to educate viewers or teach them a moral lesson. 

P.S. Until today I wasn't aware of that "absolete" is rather modern adjective which, according to urbandictionary.com, is defined as  mix of obsolete and absolute.

Debugging dynamic languages

I think CLI debugger is a must-have tool ( though best and simplest debugging tool in existence are debug prints and  asserts ) To my shame I don't have much experience with CLI debuggers for dynamic languages. Moreover, I'm not sure if any debuggers exists for an early scripting languages like sed or shell scripts. The only CLI scripting language debugger I know about is a very convenient python's pdb. 

If anyone knows any CLI debugging tools for languages like Java PHP, Caml or Lisp - please post a link in comments.