Count the number of triangles in the below picture?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What is the centre of gravity?

Solve the rebus riddle in the picture below.

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

Which five letter word can be added at the end of below word to form a
valid word?

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There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?