13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Can you name an animal whose killing cannot be performed without spilling your own blood?

In the image given, you can find several triangles. Can you count them all?

Can you count the number of blocks in the picture below?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Can you find the missing piece of the Porsche?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?