I’m tall when I’m young, and I’m short when I’m old. What am I?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

Decode this picture on T-Shirt and tell what it says ?

When does a USA Potato change its nationality?

Find the number of squares in the below-given picture.

What is the centre of gravity?

Can you find the missing piece of the Porsche?

What has many teeth, but cannot bite?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?