/u/twowheels's posts in /r/askscience

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How efficient is modern lighting technology (e.g. LED lighting) at converting energy to visible light? What are the factors limiting higher efficiency? Are they likely to ever be overcome?

14 upvotes

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What happens when you plug two 9V batteries into one another?

5 upvotes

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Why does the apparently random 'walk' of the Weazel Ball make such a regular wear pattern?

1 upvotes

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How and why do we enjoy fiction?

1 upvotes

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If I put a pendulum "generator" in a van, would it affect the mileage?

1 upvotes

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Why does indoor lighting seem less effective during the day than at night?

1 upvotes

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I'll frequently be sitting at my desk nodding off, unable to keep my eyes open no matter how hard I try, but if I give in and lay down for a nap I'll suddenly feel wide awake and unable to sleep. Why?

1 upvotes

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Is Tungsten Carbide jewelry safe? Some jewelers claim that it can leech, is that just to sell more expensive metals? Does it matter which binder metal? How can you tell which it is?

1 upvotes

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Do active noise cancelling headphones actually protect the ears, or just make the noise "seem" quieter?

1 upvotes

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Given two neighboring islands with identical language, they hear of COVID and fully isolate to quarantine. How long until they have different accents? How long until their speech is no longer mutually intelligible?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How efficient is modern lighting technology (e.g. LED lighting) at converting energy to visible light? What are the factors limiting higher efficiency? Are they likely to ever be overcome?	14
What happens when you plug two 9V batteries into one another?	5
Why does the apparently random 'walk' of the Weazel Ball make such a regular wear pattern?	1
How and why do we enjoy fiction?	1
If I put a pendulum "generator" in a van, would it affect the mileage?	1
Why does indoor lighting seem less effective during the day than at night?	1
I'll frequently be sitting at my desk nodding off, unable to keep my eyes open no matter how hard I try, but if I give in and lay down for a nap I'll suddenly feel wide awake and unable to sleep. Why?	1
Is Tungsten Carbide jewelry safe? Some jewelers claim that it can leech, is that just to sell more expensive metals? Does it matter which binder metal? How can you tell which it is?	1
Do active noise cancelling headphones actually protect the ears, or just make the noise "seem" quieter?	1
Given two neighboring islands with identical language, they hear of COVID and fully isolate to quarantine. How long until they have different accents? How long until their speech is no longer mutually intelligible?	1