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Why Didn't Evolution Give Us the Ability to Smell Fresh Water?
science.howstuffworks.com/life/evolution/humans-smell-fresh-water-evolution.htm
You'd think being able to smell drinkable water would be an evolutionary advantage. But we can only smell things that suggest potable water. Why is that?
Can You Identify the Tree From Its Bark?
play.howstuffworks.com/quiz/can-you-identify-the-tree-its-bark
From busy cities to lush jungles, from tall mountains to blistering deserts, trees can be found everywhere. Get ready to put your knowledge of trees to the ultimate test with this tree bark quiz!
Why do we remember the Alamo?
history.howstuffworks.com/history-vs-myth/remember-the-alamo.htm
The Alamo was a mission town in Texas that was converted into a fort as warring factions fought over the state. Read more about the Alamo and its mission.
Can You ID These Butterflies from an Image?
play.howstuffworks.com/quiz/can-you-id-these-butterflies-from-an-image
Are you a master Lepidopterist? If you don't know what that word means, you may have a few things to learn about butterflies. You can still pass this quiz if you think you have what it takes to identify these guys from an image.