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2. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control or ANC.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.

3. Zero-coupon bond - Wikipedia

   en.wikipedia.org/wiki/Zero-coupon_bond

   Zero coupon bonds have a duration equal to the bond's time to maturity, which makes them sensitive to any changes in the interest rates. Investment banks or dealers may separate coupons from the principal of coupon bonds, which is known as the residue, so that different investors may receive the principal and each of the coupon payments.

4. USAA - Wikipedia

   en.wikipedia.org/wiki/USAA

   USAA is a financial services group that provides insurance, banking, and investment services to military members and their families.

5. Hearables - Wikipedia

   en.wikipedia.org/wiki/Hearables

   Hearables or smart headphones or earbuds are electronic in-ear devices designed for multiple purposes. The category is split between hearables for hearing health, and ...

6. Cryptocurrency - Wikipedia

   en.wikipedia.org/wiki/Cryptocurrency

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7. iPhone - Wikipedia

   en.wikipedia.org/wiki/IPhone

   The iPhone 7 and 7 Plus were announced on September 7, 2016, which introduced larger camera sensors, IP67-certified water and dust resistance, and a quad-core A10 Fusion processor utilizing big.LITTLE technology; [40] the 3.5 mm headphone jack was removed, and was followed by the introduction of the AirPods wireless earbuds. [41]