Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

What has 88 keys?

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

What kind of tree can you carry in your hand?

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.

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

Why do people go to bed?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?