Why do people go to bed?

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

I have branches, but no fruit, trunk or leaves. What am I?

What is the end of everything?

what's the probability of getting a king or a queen from a pack of 52 cards?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?