What is so fragile that saying its name breaks it?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

How far can you walk into the woods?

Why are televisions attracted to people?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What Time Should the last watch show in the below figure?