I remember how my friend, Harriet took my mother’s recipe literally. She loved my mum’s apong balik , a Peranakan pancake made out of santan (coconut milk), sugar and flour. The pancake batter was poured into a pan over a slow fire, When each pancake was almost cooked, it was topped with ripened bananas, folded over and ready to be eaten. It was absolutely delicious! Mum told her that to make the batter, she would need a kati of flour along with a few other ingredients. Harriet went home and followed the recipe faithfully but found to her dismay that the pancakes turned out hard and doughy. She reported the result to my mother.
These assumptions have been challenged by the discovery in 2009 of two small pieces of bone airing striations made by stone. One bone was from an antelope sized animal and the other from a bovid the size of a modern cow. The bones were found at Dikika, Ethiopia within the securely dated Sidi Hakoma formation and given an age of million years. By process of elimination, trampling of the bones underfoot by animals, toothmarks or their having been tumbled in a stream were ruled out and the only explanation for the markings appears to be the use of stone to scrape flesh from the bones and striking one of the bones to fracture it and extract the marrow.
In the course of time, physics as a science underwent great changes. From a subdivision of philosophy it gradually turned into an applied science and then, in the 20th century, into an extremely complicated, greatly specialized and somewhat closed science. For the majority of this time physics has been rather ambiguously limited, describing the movements of celestial bodies and other material objects that stand behind the construction of many mechanisms and so on. To be a physicist was to know something about all these fields. But in the 20th century and, especially, after the works of Albert Einstein, everything changed. Physics split into a number of very narrow and very specialized fields, sometimes with little connection between each other. The majority of scientists work in one and the same field their entire lives.