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.

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Where do you go to learn how to make ice cream?

Identify the 10 differences between the two given pictures.

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

What goes through cities and fields, but never moves?

What has one letter and starts with an E?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?