
Researcher have revealed the ultimate window one that can block out sound, but let fresh air in. It could be the answer to any city dweller's dreams. The double glazed windows have holes designed to let air in but block the most annoying frequencies. That tends to be the range of artificial sounds, leaving the natural sounds in the 0-500 Hz range largely undisturbed. After sending sound waves of 80 decibels, which is louder than a vacuum cleaner, through both windows, the pair discovered that th...
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