There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What does this rebus means ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

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

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

What time is it when an elephant sits on a fence?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?