What is so fragile that saying its name breaks it?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

Which is the correct shadow of the bird?

What does Alexander the Great and Winnie the Pooh have in common?

You are on your way to visit your Friend, who lives at the end of the hill. It is his birthday, and you want to give him the cakes you have made. Between your house and his house, you have to cross 5 bridges, and as it goes in the land of make believe, there is a troll under every bridge! Each troll, quite rightly, insists that you pay a troll toll. Before you can cross their bridge, you have to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake. How many cakes do you have to leave home to make sure that you arrive at a friend's house with exactly two

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?