What English word has three consecutive double letters?

What has many keys but can’t open a single lock?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What does this below rebus puzzle mean?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

What happened when the wheel was invented?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?