What is more useful when it is broken?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

While sitting in the Car, John suddenly finds that one of the wheels was missing. John noticed that a killer is approaching towards him. John cannot get out of the car.

How will John escape?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

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