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2. Our Picks for Best Bike Helmets for Kids - AOL

   www.aol.com/lifestyle/picks-best-bike-helmets...

   Recommended for kids 5-8 years old, this helmet complies with the U.S. CPSC Safety Standard and the U.S. ASTM Safety Standard for multi-impact skateboard helmets. Sleek and sensible

3. Motorcycle helmet - Wikipedia

   en.wikipedia.org/wiki/Motorcycle_helmet

   A collection of motorcycle helmets worn by Moto GP racer Valentino Rossi. A motorcycle helmet is a type of helmet used by motorcycle riders. Motorcycle helmets contribute to motorcycle safety by protecting the rider's head in the event of an impact. They reduce the risk of head injury by 69% and the risk of death by 42%.

4. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first.

5. Bell Sports - Wikipedia

   en.wikipedia.org/wiki/Bell_Sports

   The Bell Star MIPS (Multi-directional Impact Protection System) is the entry-level model of the Bell Star line of motorcycle helmets. It is made using a slip-plane design and a foam EPS liner. The EPS liner is designed to deal with main impact forces while the MIPS helps prevent brain injuries such as concussions by reducing rotational forces. [13]

6. Noise-canceling microphone - Wikipedia

   en.wikipedia.org/wiki/Noise-canceling_microphone

   The internal electronic circuitry of an active noise-canceling mic attempts to subtract noise signal from the primary microphone. The circuit may employ passive or active noise canceling techniques to filter out the noise, producing an output signal that has a lower noise floor and a higher signal-to-noise ratio .

7. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   The use of noise-cancelling headphones for patients in intensive care units has been implemented to reduce the amount of noise exposure that they face while in a hospital environment. Active noise control technology is shown to have a relationship with sleep disturbance, delirium, and morbidity, therefore bringing up concerns about lowering the ...