Why are soldiers asked to break steps while crossing a bridge ?

Why are detergents non-biodegradable while soaps are biodegradable?

Why meter bridge is called so ?

Ions that must be present for binding the cross bridges is

If a stone tied at one end of a string is whirled and the string breaks, Why does the stone fly tangentially ?

Why some liquid wet the solids while others do not?

Why is it not wise to the touch the inner surface of an umbrella while standing beneath it during rain?

In a polymerase chain reaction after the denaturation step why the mixture needs to cool down to a lower temperature ? a) To permit specific annealing of the primers b) To give a halt to the reaction mixture c) To increase the activity of enzyme Taq polymerase d) To obtain the multiple copies of the DNA

Why do a cyclist lean while moving round a curved track ?