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

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If the laws of thermodynamics state that no machine can be 100% efficient because some energy will be lost to heat, is it possible to make a 100% efficient heater?

137 upvotes

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Why do MRI machines require such extremely strong magnetic fields?

128 upvotes

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Modern computer processors are built using processes on the scale of nanometers. How do manufacturers design and build something so small?

45 upvotes

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Why do plants seem to be more likely than animals to survive with mutations that duplicate entire sets of chromosomes?

27 upvotes

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How did eusociality evolve in Hymenoptera (bees, ants, and wasps)? Did it occur multiple times or just once?

10 upvotes

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When mold grows in people's houses, what is it feeding on?

8 upvotes

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If salts dissolve in water by disassociating into ions, can different salts swap ions when dissolved together?

8 upvotes

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Are brand-name drugs any better than generic ones?

7 upvotes

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Why do salmon and eels need to migrate up rivers to reproduce? Why can't they spawn where they live?

6 upvotes

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If all nucleoside triphosphates have the same free-energy change for their hydrolysis, why do our cells primarily focus on ATP as a means to transfer energy?

6 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If the laws of thermodynamics state that no machine can be 100% efficient because some energy will be lost to heat, is it possible to make a 100% efficient heater?	137
Why do MRI machines require such extremely strong magnetic fields?	128
Modern computer processors are built using processes on the scale of nanometers. How do manufacturers design and build something so small?	45
Why do plants seem to be more likely than animals to survive with mutations that duplicate entire sets of chromosomes?	27
How did eusociality evolve in Hymenoptera (bees, ants, and wasps)? Did it occur multiple times or just once?	10
When mold grows in people's houses, what is it feeding on?	8
If salts dissolve in water by disassociating into ions, can different salts swap ions when dissolved together?	8
Are brand-name drugs any better than generic ones?	7
Why do salmon and eels need to migrate up rivers to reproduce? Why can't they spawn where they live?	6
If all nucleoside triphosphates have the same free-energy change for their hydrolysis, why do our cells primarily focus on ATP as a means to transfer energy?	6