How to determine the resistor for LED light with Rechargeable Lithium Battery

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Description: Today we are going to use math and science to build a rechargeable LED light. For the science part, you will need: Rechargeable Lithium Battery, 150 ohm resistor, and white LED light (from Christmas LED lightbulb). For the math part, you...

How long does light take to travel around the earth- Math and Science Word Problem Episode 1

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Description: Today's practical Math question: How long does light take to travel around the earth? You will need to know the circumference of the earth and the speed of light to solve this question.