Scientists often say that science is a cycle of "Experiment, fail, learn, repeat". Why is this an important concept in science and should this only apply in scientific research?

Because while doing research scientist follow the scientific metod.The scientific method involves exploration and observation and the search for the answer for a question. And there will always some hypotesis that while experimenting reveal to be wrong.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."