Clownfish can CHANGE their sex! Why?

Persians invented freezers over 2400 years ago. They could even create ice throughout the long, hot summers in the desert

By 400 BC, Persian engineers had figured out how to store ice in the middle of the desert. Pretty good for ancient engineers. These "yakhchals" were located above ground. They were domed and made of heat-resistant material. This kept them cold year-round.

Ice from nearby mountains was brought in during the winter and stored there. These structures were occasionally used for storing food as well. The 60-foot conic buildings would have a massive insulation on te outside and a massive subterranean structures that would keep water cool.

The Yakhchals were so good that they allowed for cooling even during the hottest times of the year. In fact, they even had trenches on the outside that allowed for water to refreeze during the cold desert nights. This allowed them to work year round!

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During World War 1, the United States Government tried to rename hamburgers as 'liberty sandwiches' to promote patriotism

In 2003, when the United States was in the midst of the war with Iraq, France was not particularly supportive. As such, Americans attempted to rename French fries "freedom fries." A similar rebranding occurred in the US during World War I.

The government encouraged Americans to rename traditionally German foods. They attempted to rename sauerkraut "liberty cabbage" and hamburgers "Liberty Sandwiches." Whether or not Americans embraced this change, eventually we went back to calling these foods by their original names.

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The President receives about 500 death threats every month!

Whether that figure is higher or lower than you expected, it still poses a huge responsibility for those guarding him. The Secret Service gained it's protective responsibility in 1901 after President McKinley was assassinated. It used to protect presidents for life, yet in 1997, this perk was altered to only 10 years after leaving office.

In 2010, the Secret Service had more than 1300 members who provide security for the White House, the Vice President, the Treasury, and diplomats in DC. Because the President is the most powerful man in the free world, the Secret Service makes constant efforts to ensure that those 500 threats each month don’t happen. Threatening the President is a class D felony and can result in 10 years in prison!

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Fruit bat mothers cry when their baby is taken away

In what might be one of the saddest videos ever, a fruit bat mother cries as it's baby is taken away from her in order to be cleaned. According to the video, the baby’s mother may not accept it once it’s returned home. Yikes…and you thought you had it tough