A list of the 250 most highly and actively voted films on IMDB. A film has to have a certain amount of votes to be qualified for IMDB's Top 250 and they also have to be actively rated by users. Movies slide in and out of the Top 250 constantly and die-hard fans of films (e.g., The Godfather, The Dark Night) often furiously type back and fourth at one another when their favorite film slips below another. It is not uncommon to find a billion threads that read "This does not deserve to be #1" on the message boards of films such as The Shawshank Redemption, The Godfather, The Godfather: Part II, The Dark Knight, and The Good, The Bad, and The Ugly. Users will often rate their favorite movie's opponents a 1 in hopes that their favorite will rise on the list. The list is totally user-controlled and starts more fights on the site than anything else. Many find the system to be flawed and pay it no attention.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.