Hacker News on 9 April 2016

• Congratulations You’ve Been Fired
• The FBI Director Puts Tape Over His Webcam
• How a Car Engine Works
• Frog and Toad are Cofounders
• SpaceX just landed a rocket on a drone ship for the first time
• Metal foam obliterates bullets
• Parody O'Reilly book covers
• Mathics: A free, light-weight alternative to Mathematica
• Study: Students who take notes by hand outperform students who type
• SpaceX makes breakthrough by landing rocket at sea