Credit: Ars Electronica/Flickr Everyone forgets things some of the time. You walk into a room and entirely forget why you decided to enter. You are mid-conversation and suddenly space-out what was just said. Although odd and sometimes embarassing, short-term memory loss below a certain threshold doesn’t mean anything at all. However, if you are having significant, unexpected and unexplained trouble remembering things that just happened, it could be a symptom of a greater problem.

Gluten allergy symptoms. Credit: Shannonlee/Pixabay These days, it’s not uncommon to encounter a person with a gluten allergy or celiac disease. According to the Statistic Brain website, about 1 in every 133 people in the U.S. have celiac disease. Restaurants and food manufacturers are becoming more aware of this and adjusting their menus and product offerings accordingly. However, there are hidden sources of gluten in many foods. Also, some people may experience gluten allergy symptoms and not know that the reactions are related to diet.

Many types of scenery are beautiful, but few geological features are as dramatic, breathtaking, and awe-inspiring as mountains. Mountains soar high above our heads, astounding us with their heights and features. They make us feel tiny, vulnerable, and fragile, but they also lift us up at the same time, inspiring us to strive for new heights. Here are 10 of the most beautiful mountains in the world. Some of these peaks are famous, while others are not as well known.

Flick/Itamar Grinberg Filling a sunken land at the lowest point on earth, the Dead Sea in the Middle East is one of the world’s most fascinating places. It’s an incredible salty lake–one of the world’s saltiest bodies of water, in fact. As a giant solution in which 45 billion tons of salts has been dissolved, it’s about 10 times saltier than ocean water. This is not the kind of salt used to season meals.

History is full of mysteries, partly because the people that gave rise to them failed to account for the insatiable curiosity of future mystery-mongers by leaving adequate evidence behind. Fair enough, but that shouldn’t stop us from mystery-mongering and treasure-hunting to our hearts’ content. For all the Robert Stack-inspired sleuths in the audience, here are your top 10 unsolved historical mysteries. 10. Phaistos Disc (c. 1700 B.C.) Flickr / Dimitris Agelakis A second-millenium artifact covered in hieroglyphics no one can read, the Phaistos Disc contains a magical curse, a geometric proof, a militant call to arms — or perhaps the meaning of the cosmos as understood by the ancient Minoans.

Medical Symbol (Wikimedia) The universal medical symbol is a snake coiled around the Rod of Aesclepius, the Greco-Roman god of medicine. According to legend, Aesclepius, the man-god son of Apollo, learned to heal from both his deific father and his wise mentor, the Centaur Chiron. The Rod of Aesclepius has passed down to us as a paragon of the healing arts from ancient stories of this mythological figure’s medicinal exploits.

What is the hardest mountain to climb? Is it the tallest, the steepest, the one with the slipperiest rock walls or the fewest handholds? The one with the harshest weather? There are a lot of different factors that go into determining the difficulty of a climb. To a large degree, difficulty is a subjective measurement. But we can still come up with a list of challenging climbs based on a combination of these factors as well as the reports of climbers who have actually tackled these giants.

Few ideas get the blood flowing more than that of revolution. Revolution means change, and when change is desperately needed, a revolution can empower us to do more, be more, achieve more. Through revolution, we can overcome adversity and stagnation and rise up to fulfill our potential. And there’s nothing to incite a revolution like a revolutionary man or woman who takes a stand against the established order. Revolutions don’t just happen in politics or war.

Flickr / Andrew Mason Blood flows through a complex network of veins within our body, carrying nutrients to our organs, fighting off disease, and taking harmful materials to areas where they can be neutralized and disposed of. Blood is made up of 95% water, which allows it to flow easily between organs. Blood is made of a complex number of proteins and chemicals. Hemoglobin is the primary thing that gives blood its red color.

If you’re out in the wild, what’s the last creature you want to encounter? A shark? A rattlesnake? A jaguar? There are a lot of different traits which make animals dangerous. Some animals are particularly aggressive. Others are stronger or faster than we are, or have razor-sharp teeth. Still others are venomous, and can poison us with a sting or a bite. Others yet are clever and cunning. Here are the top 10 most dangerous animals in the world.