What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

What jumps when it walks and sits when it stands?

What does this rebus puzzle means ?

Count the number of squares in the picture below.

Three people check into a hotel. They pay $60 for the rent of the room. After they check-in, the manager realize that the rent for the room is $55. So, he gives $5 to the bellboy and asks him to give it to them. The bellboy thinks that it will be difficult for the three people to share $5 among them and seeking the personal benefit, he pockets $2 and gives the remaining $3 to them.

Now, each person paid $20 and got back $1. In this manner, each of them paid just $19 which totals to the amount of $57. The bellboy has $2 with him and adding them, we get $59. So where is the remaining $1?

Can you solve below mathematical equation?

2^1234 - 2^1233

What do you see in the image below

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Find the Odd One Out?
84129
32418
47632
36119
67626
72927