I am white when I am dirty, and black when I am clean. What am I?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I know a nine-letter word having only one vowel.
Do you ?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

What does this rebus riddle mean?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

Some friends went on a vacation to a resort. It was raining heavily and it kept raining for thirteen days.

When it rained in the morning, the afternoon was beautiful and when it rained in the afternoon, the day was blessed with a clear morning.

Overall, the friends experienced eleven nice mornings and twelve nice afternoons. Can you find out the number of days they spent on vacation?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?