Some items you use every day are hiding some secrets, and once you know them, you can take the most out of them. For most refrigerators, you can change the way you open their doors if you reverse the handles. Next time you want to have some fresh lemon juice, just use a pair of kitchen thongs.

Place the lemon between the thongs and use the force of the tool to squeeze all the juice out in no time. You may have noticed some weird bumps on the concrete sidewalk – especially in crowded or high-traffic areas, but do you know what they're for?

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