每天一篇「今日美史」，提煉和總結歷史在今天發生的重要事件：誰，在哪裡，什麼時候，做了什麼，這件事為什麼重要，以及在寫關於什麼主題的論文的時候可以作為潛在的論據引用。
每天30秒，輕鬆積累史實，為AP美國歷史拿5分打下堅實基礎
When: 1879
Where: Menlo Park, NJ
Who：Inventor Thomas Edison
What：
After applying to the Patent Office on this date for his carbon fiber filament, electric lightbulb. The next day he conducted his most successful test: a light that had burned continuously for over 13 hours. It was the first practical and commercial incandescent light bulb.
Why significant：
Gas and oil lighting were the most common forms of illumination until this time, Those forms posed obvious safety hazards and Edison's goal was to create a new form using his particularly favored current of electricity.
Tags：Alternate Current, Direct Current (AC DC), Westinghouse
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