After we’ve been using something every day for many years, sometimes we find out that it has some other useful features. For example, did you know that the metallic zipper has a hidden lock inside? If you turn the zipper upwards, it gets locked, if you turn it downwards, you can open it easily. By the way, if you use an iPhone, you'll be surprised to find out that it also has a secret to share. The round hole on the back part between the flash and the camera serves as the second microphone. So it's not some random design feature... What about a bottle of sunflower oil? It's also not as simple of an object as it might seem...

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