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30 дни за връщане на стоката
In order to learn what may be expected from this book, please conduct the following experiment. This experiment was originally published in one of my earliest scientific jouranls. Experiment Material List Tongue Ruler Lips Lungs Step 1: Stick out your tongue. It should protrude approximately one half to three quarters of an inch from your mouth. Step 2: Press your lips firmly, but not forcefully, against your tongue. Step 3: Exhale, allowing air to build in your cheeks until the pressure overcomes the seal. Step 4: Note the outcome.