A man dies of old age on his 25 birthday. How is this possible?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

What's the next in the series?

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

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?

What does this say?

XLR8

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Which city is three-fifths chick two third cat and 50% goat?