How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What is the next number in this matchsticks series riddle?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

What makes this number unique: 8,549,176,320?

Find the 8 in the below-given Image.

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Find the missing letter in the last circle logically in the given below picture.

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?