What is more useful when it is broken?

What's a single-digit number with no value?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

How many Watermelons are there in the below picture?

There is a place where if I stand up straight, I will still be considered sideways.

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Can you find the missing piece of the Porsche?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
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* * *