A pretty interesting on the economics of marijuana sales and state/federal laws in the US.
Growing and selling marijuana are, like using it, legal under Colorado law. But banks tend to take their cues from the federal government. Not only does selling marijuana violate federal law; handling the proceeds of any marijuana transaction is considered to be money laundering. Very few banks are willing to bear that risk.
Like the great warlord Oda Nobunaga, Yamauchi wanted his vassals to compete with each other. Nintendo once had three hardware development departments plus EAD. Each of these three departments had its own game development team, and Yamauchi made the leaders of these departments compete with each other. This resulted in successes like the Nintendo Entertainment System and Game Boy, but the departments never shared information with each other.
A fascinating look behind the scenes.
Reading Steffen Rendle’s paper of Factorization Machines (PDF). Not only is the algorithm interesting, the paper itself is worth mentioning because instead of only equations, it includes a real-world example. More ML researchers should take note.