When Were the First Cigarettes Made?
Cigarettes appear to have had antecedents in Mexico and Central America around the 9th century in the form of reeds and smoking tubes. The S
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Health
Why Is DDT Dangerous?
After extensive use as a pesticide, DDT was found to have many harmful after-effects on human beings and animals. The control of insects was
Who Is a Midwife?
Who Is a Midwife? A midwife is a professional in midwifery, specializing in pregnancy, childbirth, postpartum, women’s sexual and reproducti
Who Discovered Typhoid Vaccine?
Who Discovered Typhoid Vaccine? Typhoid vaccine, which gives immunity against typhoid fever, was discovered by Sir Almroth Wright (1861-1947
Who Founded the Mayo Clinic?
Who Founded the Mayo Clinic? The Mayo Clinic in Rochester, Minnesota, United States, was founded by William Worrall Mayo. He opened a medica