If dementia is preventable, it means we're changing the trajectory of cognitive decline — which means that trajectory isn't inevitable.

The third and deepest reason this matters—why it's not just commercially meaningful but potentially world-changing—is the ability to bridge different levels of abstraction.

There is nothing really so bad about a recession. A recession is very much an economy pausing for breath to re-evaluate where it stands and to assess where to go next.

Even if we end up with better regulations, we'll still have 300 million guns washing around the US, and that's going to be a huge problem for decades, because guns last a long time.

In the 21st century, there are cameras everywhere except for where our food and energy come from, and where our waste goes. We are the most powerful species in the world, but we remain blind to the fundamentals that allow us to survive. How are we blind to our life support system?