Let's Start The Week With A Quiz,

an easy one,


use two threes (3), two eights (8), multiplication (×), division (÷), addition (+), subtraction (-) signs, and brackets, in order to get the number 24.

You can not use any advanced arithmetic operations, such as exponential, factorial, etc.

and the answer is,

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8 ÷ (3 – 8 ÷ 3) = 24

too easy I know, so here is another one,

You are sitting in a motionless car, which is tightly sealed, i.e. no open windows, holes in the car, etc. A helium balloon on a string is tied to the floor. If you start accelerating the car, is the balloon going to move back, forward, or stay in place?

and the answer is, 

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the reason the balloon floats up in the air is that the helium has a lower density, so when gravity pulls the denser air around down, the balloon gets pushed up, similarly, when the car accelerates, the air around gets drawn to the back of the car, which makes the helium balloon go forward, it takes a bit of thinking but it is true.