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

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If mitochondrial DNA is always inherited from the mother, is the same true for chloroplast DNA? What about other organelles?

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Why do pilot fish follow ships? Is it because they mistake the vessels for the sharks they follow in nature?

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Yeast are unicellular fungi that evolved from multicellular ancestors. How did this happen? Are there other examples of multicellular organisms that evolved back to being unicellular?

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Why do metals have to be shielded from the atmosphere during welding?

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I once heard that spent nuclear fuel could be made safer by transmuting radioactive isotopes into safer ones. How does this work? Which isotopes can be treated in this matter?

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Which specific radioisotopes are causing the emissions that make it unsafe to enter the Chernobyl Exclusion Zone right now?

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How large does an asteroid have to be in order to not burn up completely while entering Earth's atmosphere?

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Skeletons are made out of the mineral hydroxyapatite. How did animals evolve the ability to build bones out of this material?

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Mammals and birds both have REM sleep. Does this mean that REM evolved in an ancient reptilian ancestor, or did it involve independently in the two extant groups?

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Recently, a solar storm knocked 40 Starlink satellites out of commission. How do satellite engineers normally deal with solar storms?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If mitochondrial DNA is always inherited from the mother, is the same true for chloroplast DNA? What about other organelles?	3
Why do pilot fish follow ships? Is it because they mistake the vessels for the sharks they follow in nature?	1
Yeast are unicellular fungi that evolved from multicellular ancestors. How did this happen? Are there other examples of multicellular organisms that evolved back to being unicellular?	1
Why do metals have to be shielded from the atmosphere during welding?	1
I once heard that spent nuclear fuel could be made safer by transmuting radioactive isotopes into safer ones. How does this work? Which isotopes can be treated in this matter?	1
Which specific radioisotopes are causing the emissions that make it unsafe to enter the Chernobyl Exclusion Zone right now?	1
How large does an asteroid have to be in order to not burn up completely while entering Earth's atmosphere?	1
Skeletons are made out of the mineral hydroxyapatite. How did animals evolve the ability to build bones out of this material?	1
Mammals and birds both have REM sleep. Does this mean that REM evolved in an ancient reptilian ancestor, or did it involve independently in the two extant groups?	1
Recently, a solar storm knocked 40 Starlink satellites out of commission. How do satellite engineers normally deal with solar storms?	1