What has 13 hearts but no other organs?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

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

A man is approaching a broad and barren land. He has a package with him. If somehow, he is unable to open the package before reaching the land, he will die.

Can you guess what is present in the package?

There is something which you can be arrested for attempting but not for successfully completing.

Do You See It?

What is the word or phrase?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?