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.

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...