What goes up but never comes down?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

The Little ant seems to be always confused. Do you know why?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

What is the longest word in the dictionary?