They tackle topics such as working out how to clean dirty water; investigating whether plants need soil to grow; learning how exercise affects heart rate and why different types of chocolate have different melting points; figuring out how to change the pitch and volume of a sound with instruments made in the classroom and identifying what factors affect the size of shadows. (education-today.co.uk)
But during the day, whale watch boats, snorkeling charters, and naval ships produced volumes of sound up to 45 decibels higher than the natural nautical noises. (sciencemag.org)
Having such high levels of control over the range and volume of the sound pumping into your ears is something that can't be taken for granted, and I do miss it when I bypass the Tactical Audio Controller out of laziness. (windowscentral.com)