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

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

Assume you have the white pieces, can you win in half a move?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

Find the value of "a" by solving the maths equation in the picture below:

Which holiday are we talking about?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?