What does this below rebus puzzle mean?

What has a bottom at the top?

Before Mount Everest was discovered, what was the highest mountain in the world?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Find the next number in the series.
1 10 24 43 67 ?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

Using Only Five 5's and any mathematical operator make sum as 37

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

How far can you walk into the woods?