Portal:Environment/Did you know

Usage
These "Did you know..." subpages are randomly displayed using Random subpage.
 * 1) Add a new "Did you know" to the next available subpage.
 * 2) Update the "Random subpage" start and end values above to include the new DYK and evenly distribute the number of items across all four display templates.

Nominations
More "Did you know"s can be nominated here. General guidelines for nominations, loosely based on Did you know include:
 * Pick DYKs in articles that are interesting.
 * Look for articles that are over 1,000 characters in size - no stubs.
 * The "Did you know?" fact must be mentioned in the article.
 * Try to select articles that cite their sources, particularly the item mentioned.