What does below pictogram mean?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Can you solve the below tricky visual equation?

What is so fragile that saying its name breaks it?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Decode this picture on T-Shirt and tell what it says ?