The Number of Entities

Losing something we already have is twice as much pain than gaining the same. This skewed feelings towards loss is known as loss aversion.

Expectations always dampen the feelings of happiness, always setting us up in advance for a dose of disappointment.

There is a limit to the number of ideas you can comprehend at any one time.

The mind cannot hold more than about seven items in its short-term memory at any one time. Some minds can hold as many as nine items, while others can hold only five...

Especially before bed. Phones and tablets emit light that’s skewed heavily toward the blue end of the visible spectrum and these frequencies are especially influential in human sleep cycles.

Using a “night mode,” available on some phones, is supposed to minimize that effect.