Apple designed a new butterfly mechanism to increase precision in typing. It has a single assembly and is made from a stiffer material. This results in more stable and responsive keys. It also takes less vertical space.
How will you feel when someone asks you to squeeze their phone and see what happens. Weird though it may sound but it is true. With HTC U11, you got to squeeze your phones to do certain tasks. The phone recognizes short squeeze and long squeezes.
A dual camera consists of two cameras, a primary camera which acts as a regular camera. The other one is a secondary camera which can serve various purposes from capturing details to adding a different angled shot to the original one.