3. • Edmund Halley observed Halley’s comet and
calculated its orbit and period (1682).
• Benjamin Franklin invented the lighting
Conductor (1752).
• Joseph Priestly discovered Oxygen (1755).
• Wilhem Rontgen discovered X-rays (1895).
• E.Rutherford discovered Alpha particles (1906).
• Michael Faraday discovered Electromagnetic
induction (1831).
• Alessandro volta constructed the first Voltaic cell
(1793).
4. • Einstein published his theory of Relativity
(1915).
• Klaus von kiltzing discovered Quantum half effect
(1977).
• James Bradley discovered the Aberration of light
(1727).
• Robert Hooke discovered Cell (1665).
• Sir. Alexander Flemming discovered Antibiotic
(1928).
• Jonas Salk perfected Polio vaccine (1952).
• Kary Mullins developed in Vitro gene cloning
(1988).
5. • Karl von Frisck studied the dance of Honey
bees for Communication (1973).
• Yuri Gagarin orbited the earth in the
Artificial satellite (1961).
• F.G. Banting and C.H. Best developed
Insulin (1922).
• Henry Becquerel discovered Rodio activity
(1896).
• Joseph Lister used carbolic acid as antiseptic
(1867).
• Galileo invented Telescope, discovered
Sunspots (1610-1613).
