Mark Zuckerberg on Taking Risks and Finding Talented People

A set of middle school students’ heights are normally distributed with a mean of 150 cm and a standard deviation of 20 cm. Darnell is a middle school student with a height of 161.405, so it would have a shape that looks something like that. That’s my hand…

Making decisions is an essential life skill, and mastering it can impact your life, success, and happiness. Decisions, be they big or small, can shape our paths more than we can imagine. They determine what jobs we choose, the relationships we build, and …

I remember vividly at the dedication 20 years ago of the memorial. There was a World War I veteran in her uniform who spoke. She said, “When I served in the Navy, women were not even allowed to vote.” I thought, what a brave woman! So in that hundred year…

The crisis of credit visualized. What is the credit crisis? It’s a worldwide financial fiasco involving terms you’ve probably heard, like subprime mortgages, collateralized debt obligations, frozen credit markets, and credit default swaps. Who’s affected?…

Let’s make a fresh jar of smoke. The problem with old jars is their safety buttons are popped up. Everyone can tell they’ve been opened. But you can reverse this by sparking up some combustion. Dump the flame in the jar, and the flame will turn oxygen int…

When you look at a rain forest ecosystem like this, one of the obvious questions may be: where do these plants come from? How do they grow? They’re growing all the time, getting larger and larger and larger. Where does that mass, where does that matter co…