Hi! I'm Erica Joy Decker. I'm a User Experience Designer at eBay. I focus on user research, information architecture, and interaction design.
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The Pareto Principle (the 80 / 20 Rule) can help usability

The Pareto Principle stipulates that a high percentage of users will perform a low percentage of actions. In other words, most users visit a small percentage of pages or perform a small percentage of tasks. By identifying what small percentage of actions most users are performing (by using analytics, research, interviews, etc.), a higher emphasis can be put on those tasks and actions to make the site easier to use. Knowledge of the Pareto Principle can also help to illustrate content and features that users are not accessed or used (aka: content and features that could be removed to create a more streamlined and usable site). Source: 10 Laws to Design By, by 3.7 Designs

Lemurs value stinkiness

During mating season, male lemurs battle for dominance by trying to outstink each other. They cover their long tails with smelly secretions and wave them in the air to determine which animal is more powerful. Source: National Geographic

Clownfish have the ability to switch their sex

All clownfish are born male, and the most dominant male in a community changes its sex to female and mates with the next-most-dominant male. Source: National Geographic

3-4 is the new magic number

According to more recent research, people can remember about 3-4 things (for about 20 seconds) and then they disappear from memory unless repeated over and over. In addition, people tend to chunk information into groups that have 3-4 items in them. On top of that, researchers tell us that people can’t effectively choose between more than 3 to 4 items at a time. Source: What Makes Them Click