<i>Not-technical</i><p>&quot;The World&#x27;s Toughest Endurance Challenges&quot; - Very nicely illustrated<p>&quot;Thing Explainer: Complicated Stuff in Simple Words&quot; - Extremely enjoyable. People here certainly are aware of xkcd and it&#x27;s type of humor.<p><i>Technical</i><p>&quot;Functional programming in Scala&quot; - good read for Scala beginners, especially after &quot;Scala for the Impatient&quot;<p>&quot;Learning Spark&quot; - the best book on Spark so far<p>&quot;Assessing and Improving Prediction and Classification&quot; - couple of interesting ideas for ML and Data Science<p>&quot;Neural Network Design&quot; - Quite basic, but I like the flow and introducing mathematical concepts just before they&#x27;re needed.