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4 Signs You're Infected with a Parasite If you have a gut feeling something is off in your physical or mental well-being, a parasite could be to blame. The Joshua Tree Is in Danger of Extinction Joshua trees are iconic, ancient and in danger of disappearing. Although they can live for up to 300 years, climate change is threatening their very survival. Orangutan School Is in Session Orphaned Bornean orangutans need all the help they can get — the Borneo Orangutan Survival Foundation teaches these primates the art of survival. Changing the Guard's Historical Roots While it's technically just a glorified shift change, tourists still flock to it. But why? The Science Behind Getting Ripped Hypertrophy is a scientific term for building muscle. Here's how to do it. Sagrada Familia Basilica Is Almost Finished, After Just 137 Years This beautifully ornate cathedral will finally be completed in 2026. Architect Antoni Gaudí conceived of it as a "forest in stone." Copyright © 2019 HowStuffWorks, All rights reserved. You are receiving this email because you opted in at our website howstuffworks.com Our mailing address is: HowStuffWorks 675 Ponce de Leon Drive NE Suite 8500 Atlanta, GA 30308 Want to change how you receive these promotional emails? You can update your preferences or unsubscribe from this list