2.

Learning ideas are useful to a point. To make a general idea useful, some key obstacles need to be overcome:

• We need to notice the idea in other contexts. Research found that people tend not to apply patterns they learn to different domains unless prompted.
• ...

So, for the longest time, I outsourced my taxes. As a teenager, my parents’ accountant let my brother and I file with them for free. And as I got older, I started using H&R Block, since they offer discounts for college students.

If I can do it, anyone can do it — and that’s true not just f...

Education serves two purposes:

• Teaching valuable knowledge and skills. This is known as the human capital theory.
• Ranking students according to their ability, conscientiousness and ambition. This is known as signalling theory.

If an...