November 23, 2020

Tobacco and Slavery

When America was in the process of colonization by European powers who began settling their people there, they required large numbers of labors to work on their farms. Most of the people who were enslaved and sold in America were Africans. The transatlantic slave trade involved many millions of people, and its history and legacy have had an impact all over the world. There were European slave traders, ships’captains and sailors as well as African traders and the African people captured and enslaved. They cultivated the land which were highly fertile and produced crops in vast quantities. Colonizers saw that… Read More »Tobacco and Slavery

Carbon Dating

An element can exist in different forms which have same chemical properties but different atomic weights. They have same atomic mass because number of protons are identical but additional neutrons make then different in weight. Such atoms are called isotopes. For example carbon which has 6 protons and 6 neutrons have an isotope which have 6 protons but 8 neutrons.  They are represented as C14 and C12. Addition of extra neutrons make them less stable and many of them are radioactive. The rate at which a particular atom decays is independent of temperature, light or darkness. During decay the atom… Read More »Carbon Dating

Is there life on Mars? Again Microbes hold the key

Earliest life of single cell evolved into 3 branches having distinct traits. The branches further subdivide into more branches on the evolutionary tree of life called Phylogenetic tree of life. The first three branches are called Bacteria, archaea and Eucaryota. As we can see in this tree, there is a member of archaea family with the name Methanogen. This microbe holds the answer for presence of vast quantities of methane which is trapped inside the ice cages called methane hydrates. These hydrates are found in Earth’s in permafrost regions having very low temperatures or under the deep sea floor. Water… Read More »Is there life on Mars? Again Microbes hold the key