Find the next number in the sequence

1, 2, 6, 21, 88, __?

John was piloting a plane behind a car but was never able to overtake it. Why?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

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 is a place where if I stand up straight, I will still be considered sideways.

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Which is faster, Heat or Cold ? Explain.

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?