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+## some notes for efficiency
+
+* Effectiveness is All about Managing Your Time, Energy, and Attention
+  <http://www.productiveflourishing.com/effectiveness-is-all-about-managing-your-time-energy-and-attention/> 
+
+* Manage Your Energy, Not your time
+<https://hbr.org/2007/10/manage-your-energy-not-your-time>
+
+* 尽量脚本话工作，不要重复手动操作，vim， emacs， perl 
+
+
+* emacs - dired mode
+  * map backspace  to up directory
+