Electric Bulb
作者：YT Kartick
1. Future Potential
1.1. Energy Efficiency
1.1.1. Smart Bulb
2. Who?
2.1. Thomas Edison
3. How?
3.1. Electricity heats
3.1.1. produces light
4. Process
4.1. Filament making
4.1.1. Assembling
4.1.1.1. Testing
5. Impact
5.1. Brighter homes
5.1.1. Use for work
6. Evolution
6.1. Incandescent
6.1.1. CFL Bulb
6.1.1.1. LED Bulb