Interesting Facts About Science - 006 #science #sciencefacts #compete4exams #eduvictors
Interesting Facts About Science - 006
1. An autopsy or postmortem examination is a complete inspection of a corpse. An autopsy can help determine the cause of death.
2. Pathologists are specialized doctors who usually carry out autopsies. Examination of organs can tell a pathologist whether death occurred from natural causes or whether foul play was involved.
3. Starch and cellulose are carbohydrates found in plants.
4. Glycogen is a carbohydrate found in animals.
5. Carbon-14 (C-14) is a radioactive isotope that scientists use to calculate the age of rocks and very old archaeological items.
6. Lead-210 isotope is present in our food, and it accumulates in the body during a person’s life. Once people die, their bodies no longer take in the isotope. Every 138 days, half of the lead in the body decays, or breaks down, into another element. After twice that time, 276 days, three-fourths of the isotope is gone. Calculating the amount of isotope remaining in the bones enables scientists to pinpoint the time of death within a year.
7. Both Hippocrates and Aristotle knew that the movement of the blood within the body was basic to the processes of life. According to Aristotle, the heart being the central organ in the body is the seat of intelligence.
8. William Harvey (1578-1657) was the first known physician to describe completely circulation and properties of blood being pumped by the heart to all parts of the body. He explained systemic circulation i.e. how blood travels in veins and arteries.
9. Later Marcello Malpighi, an Italian biologist studied the lungs of bats under a microscope and established the concept of capillaries. Thus he completed Harvey's circulatory system.
10. You might have heard about Marlphigian tubules which are excretory organs in some insects. The system is named after Marcello Malpighi.
11. A pumice is a volcanic glass formed from foamy, gassy magma that cools quickly during a volcanic eruption. Pumice stones are full of cavities, making them surprisingly light in weight and allowing them to float.
12. A quartz is a type of mineral consisting of silicon dioxide that forms hexagonal crystals or crystalline masses that when placed in an electric field oscillating at a constant frequency.
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