Why do runners run in anti-clockwise direction?

As the heart is on the left side, for humans and animals, running anticlockwise makes the centrifugal force of the body to act from left to right.Whereas it is from right to left for clockwise running.
        Superior venacava (the principal vein carrying blood to the heart) takes blood to the heart aided by heart suction.This vein carries blood from left to right.
        Centrifugal force due to anticlockwise running helps this suction.If we run clockwise, the centrifugal force impedes suction. That is why, in olden days, health officers ensured that all carnival merri-go-rounds were run only in the anticlockwise direction.
        Racing tracks, animal shows in circuses, bullock-drawn pelton wheels, all mostly have only left turns. Stairways in temple towers have only left turns for going up. Clockwise running tires people, especially, children, easily.

Why do birds fly in formation shaped like the alphabet 'V'?Which bird works the hardest in such a formation and why?

The bird in the lead (at the forward point of the 'V' formation ) works the hardest by being the first to 'break through' the air,which offers resistance to its flight.Just as a boat leaves a V-shaped wake of smoother water behind it(actually the lead bird creates a trail of air turbulence that helps lift along the V-shaped direction),and it is a bit easier for the other birds to fly in the wake of the lead bird.

If you watch a V-formation carefully,you'll notice that the lead bird does not stay in that position for a very long and will drop back into the formation,while another,not as tired bird takes the lead,breaking through the air first.

Is it true that a red flag agitates a bull?

It is generally believed that anything red makes a bull angry and causes it to attack.Therefore,the bull fighter has to have a bright red cape and use a red cloth.The truth is that if the bull fighter had any other coloured cloth he would be able to accomplish the same reaction from the bull.Bulls are colour blind.Many experiments were conducted  where they used white cloth and got the bulls to behave in the same way as with the red cloth.

                           The reason is the movement of the cap and not the colour of the cloth brings about the reaction in the bull.Anything waved in front of a bull would excite it.