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Agriculture on a large scale:
Crops had to be planted and harvested in the right season. Floods were a recurrent phenomenon in the river valleys, for which it was essential to be prepared beforehand. The observation of sun and stars to fix the length of a year became so precise that already in 2700 B.C., the Egyptians were able to fix it at 365.2422 days! Sumerians and their successors in Mesopotamia adjusted t'he solar (sun-based) and lunar (moon-based) calendars through accurate observations. They invented the sexagesimal system of 360 degrees in a circle (near enough to the days in a year), 60 minutes in an hour, 60 seconds in a minute. The exercises were carried out using mathematical tables and ied to algebra and arithmetic of the later epochs. Another occupation that came to be very prestigious with the growth of cities was that of medicine. Although the practice of medicine was limited to treating wounds, dislocations, fractures etc., the practitioners could successfully diagnose many diseases. They could compare cases with one another, notice different diseases and record them. From such descriptions, orally passed on to later generations, arose the sciences of anatomy and physiology. Practitioners of medicine also had the knowledge of plants and mineral substances to prepare drugs for various diseases. They grew plants and herbs for this purpose. It is from this source that the science of botany arose later. The basis for chemistry was laid in the observations and practices of jewellers, metal- workers and potters. They knew about at least nine chemical elements-gold, silver, copper, tin, lead, mercury, iron, sulphur and carbon, and also about a variety of dry and liquid reagents. The process of smelting ores, of purifying metals, of colouring them, of adding enamel%-all involve complex chemical reactions that were learnt by many trials and experiments. However, chemistry never rose to the rank of a recognised science in the 'Bronze Age.
What is the professional name for the person who studies fossils? Paleontologist
Explain the Creatinine Clearance Test It determines how efficiently the kidneys are clearing creatinine from the blood and serves as an estimate of kidney function. It compare
Which is the largest reef? This is the Great Barrier Reef off the northeast corner of Australia.
how is it
Hormonal system: Most of us are not even aware that another system works constantly, along with the nervous system and the muscles, to direct our bodily functions. The system
How to neutralize the ethyl alcohol used for determined alcoholic acidity.
1. The red shift seen in all distant galaxies, whose size is proportional to its distance from us, what effect will this have on planet Earth?
What are the Factors Affecting Soil Formation Parent materials formed due to weathering of rocks are transported from the place of their origin and re-deposited before they ar
how can a person breathe
Sequence of Actions : The precise sequence of actions in emergency situations is governed by the circumstances. The following order is of general application: (1) Quickly rem
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