South Korea sent 10,000 masks to honor the Navajo Nation, which has been hard hit by the Covid-19 virus.

Around 800 Navajo men served as Code Talkers during the Korean War.

The Covid-19 virus has struck the Navajo Nation hard, with over 6000 confirmed cases and 277 deaths.

Today, there is only one unbreakable code ever used by the Marine Corps: the Navajo language.

Kathryn Sullivan is the only person to go into space and travel to Challenger Deep, the deepest spot in the ocean.

Kathryn Sullivan is a woman who is both an astronaut and an oceanographer.

The submersible, or underwater vehicle, that Sullivan used had to be strong enough to endure the 2200 metric tons of pressure.

The highlight of this mission was a call between the Space Station and the submersible.

Researchers have found footprints that they believe belonged to a prehistoric crocodile that walked on its hind legs.

The prehistoric crocodile footprints are believed to be between 110 and 120 millions years old.

Researchers believe that this discovery will change how many people think about crocodiles.

The footprints have been discovered in South Korea, although the research team is from Colorado.