Make a natural whistle
Explorers need to have a portable first-aid kit. They also need other tools to deal with any emergency—for example, a whistle. Yeah, having one of those in your backpack would come in handy if you get lost in the forest. However, what if you forget the whistle at home? Houston, we have a problem! But, don’t worry, there is always a solution for every issue.
Nature is very wise. Really. Once you learn a few tricks, you’ll feel more at ease. Let’s go back to the whistle. Did you know that you can use an acorn cap to substitute them? That’s right, and you can find one in the forest! Hold the hollow part as shown in the picture, blow into it, and voilá! Now you have an eco-friendly whistle.