System Haptics on the iPhone 7. Apple introduced the Taptic Engine with the iPhone 6s, where it replaced the old vibration motor and was also used to provide haptic feedback for when you activated 3D Touch. This year with the iPhone 7, Apple has improved the Taptic Engine and it plays a critical role in simulating the press of the Home button, which is no longer a physical button.
The Dietary Guidelines for Americans 2010 recommends that sedentary teenage girls consume 1,800 calories per day. Active teenage girls get daily physical activity that is equivalent to walking more than 3 miles per day at 3 to 4 miles per hour. These teens need 2,400 calories per day.
According to theory, your teen will gain one pound of weight by consuming around 3,500 calories (6). On an average, your teenage girl needs 1,600 to 1,800 calories per day, while your boy will need between 2,000 and 2,400 calories per day if they mostly have a sedentary lifestyle (7). Roughly, one to two pounds per week is an ideal number for healthy weight gain in teens.