Statistics (e.g., number of galaxies in the universe, number of unemployed workers in a country) change over time. If current information is important to understanding your topic, check the following:

• When was the entry published?
• How current are the author's sources?

Search key words (e.g., unemployed Iran) excluding a specific number in order to avoid limiting results to that number (called "confirmation bias").

Corroborate using different types of sources, especially:

• Media that tend to be current (e.g., news, blogs, web pages, magazines)
• Reports (e.g., journals articles, polls and surveys, scientific or government reports)

Always ask yourself:

• Where did that number come from?
• How was that number measured?