1. The greatest scientist

2. Thomas Alva Edison

3. Background 11th February, 1847 American scientist and inventor
the 7th and the last child
mother (school teacher)
father (grocery shopkeeper)
started to talk at age 4
attended school for only 3
months

4. built a science laboratory at basement at age 10
Background
built a science laboratory at basement at age 10
suffered from ear problem
train accident at age 15
became a telegraph assistant
at age 16

5. Contributions
phonograph
kinetoscope
light bulb
kinetograph
telegraph

6. The structure of a bulb inert gas filament 惰性氣體 support wires wires
(for electricity
to pass through)