What seven-letter word has hundreds of letters in it?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Find the hidden tiger in the given optical illusion ?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

What is the centre of gravity?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?