What does this below rebus puzzle mean?

What does an Island and the letter T have in common?

What is at the end of a rainbow?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

Spot the cat in the picture below

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

Can you solve the below tricky visual equation?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?