You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

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

Which flower has two lips?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

What two things can you never eat for breakfast?