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

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Rocket propulsion - always about squirting fuel in an opposite direction to travel. Is there a hypothetical means of propulsion that doesn't work like this?

5 upvotes

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In the double slit experiment, the peaks and troughs cancel out from the light from the two slits. Why does the peak and trough from a single slit not cancel out on the display screen?

4 upvotes

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Iron Lung - why a huge negative pressure respirator, and not a small positive pressure facemask?

3 upvotes

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Plasma TV's work differently depending on the altitude - surely not?!

3 upvotes

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PTC's relevance to supertasters.

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Laser + collimator lens : Angle beam leaves aperture depends on distance of laser to lens!?

2 upvotes

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A small 5 inch blacklight tube: Compared to sunlight, how much UV would my skin be exposed to?

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Global population - how is it calculated? My friend said "What? They went around Africa and did a head-count? Europe didn't discover it back then!"

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I was born with carrot-red hair, I'm now 35 and it's brown. AskScience, what happened!?

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If the Zika virus has been around years - why is it being reported as just starting to arrive at new locations?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Rocket propulsion - always about squirting fuel in an opposite direction to travel. Is there a hypothetical means of propulsion that doesn't work like this?	5
In the double slit experiment, the peaks and troughs cancel out from the light from the two slits. Why does the peak and trough from a single slit not cancel out on the display screen?	4
Iron Lung - why a huge negative pressure respirator, and not a small positive pressure facemask?	3
Plasma TV's work differently depending on the altitude - surely not?!	3
PTC's relevance to supertasters.	2
Laser + collimator lens : Angle beam leaves aperture depends on distance of laser to lens!?	2
A small 5 inch blacklight tube: Compared to sunlight, how much UV would my skin be exposed to?	2
Global population - how is it calculated? My friend said "What? They went around Africa and did a head-count? Europe didn't discover it back then!"	2
I was born with carrot-red hair, I'm now 35 and it's brown. AskScience, what happened!?	2
If the Zika virus has been around years - why is it being reported as just starting to arrive at new locations?	2