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

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Using eight eights and addition only, can you make 1000?

Forwards I am heavy, backward I am not. What am I?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?