Over the centuries, our view of light has changed dramatically. The first real theories about light came from the ancient Greeks. Many of these theories sought to describe light as aray-- a straight line moving from one point to another. Pythagoras, best known for the theorem of the right-...
Many of these theories sought to describe light as a ray -- a straight line moving from one point to another. Pythagoras, best known for the theorem of the right-angled triangle, proposed that vision resulted from light rays emerging from a person's eye and striking an object. Epicurus ...
Many of these theories sought to describe light as a ray -- a straight line moving from one point to another. Pythagoras, best known for the theorem of the right-angled triangle, proposed that vision resulted from light rays emerging from a person's eye and striking an object. Epicurus ...
There is a difference between knowing how to work something and how it works. For flashlights, working one requires making sure you have batteries, that the lights work, and knowing how to turn them on. But how does an LED flashlight work? An LED, or li
Unfortunately, a few days later, the winning fisherman, Bello Yakub, was arrested when judges realized he had actually brought a dead fish from another river [source: BBC]. Where did the name "noodling" come from? Nobody's certain how the word "noodling" came to describe handfishing...
Ordinal numbers like first or 10th show position or order in a sequence. They describe something’s place in relation to other things, such as chronological order, rank, or simply items in a list. Ordinal numbers versus cardinal numbers? While ordinal numbers show position, cardinal numbers sh...
7. A flashlight. 8. Money. 9. A copy of all your important papers. (Be sure to make a B.O.B. as light as possible.) Places to keep a B.O.B. You should put a B.O.B. at a place where you can get it conveniently when disasters happen. Your home, your car, or your offic...
A flashlight comes in handy when you need to signal, set down a light to work on a task, or any time you want the strongest portable light. When buying a 1000 lumen flashlight you have some factors to weigh and some terminology to learn. A 1000 lumen flashlight is bright enough to let...
Describe how your leadership aligns with your principles and how you displayed leadership in one or two sentences in a specific case. Discuss what you’ve learned. Finish with a powerful sentence. What will you do differently in the future due to what you’ve learned about leadership and yours...
aIt is hard to describe how large the universe is. 描述是坚硬的多么大宇宙是。[translate] aknee-high to a grasshopper 膝盖高对蚂蚱[translate] aHello, who are you? What's your name? 你好,您是谁? 您的名字是什么?[translate] a从而没有太多的朋友 Thus does not have too many friends[transla...