What is in seasons, seconds, centuries and minutes but not in decades, years or days?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What has a ring but no finger?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Which Burger Is Different in below image?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

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