What number comes next in this sequence:
7 8 5 5 3 4 4 _

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

What has many teeth, but cannot bite?

What is the relationship between these matchstick pictures below?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

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

I have feet, but no legs. Which animal Am I?