When does a USA Potato change its nationality?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

Count the number of triangles in the given picture.

What is the Surname of Barbie Doll?

What do you call a fish without an eye?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

Prove that twice of ten is the same as twice of eleven.

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

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?