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1500 questions
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What could cause hairs to gray at the tips but not the roots?

I have noticed that some of my sporadic gray hairs are gray at the tip side but oddly, not near the roots. Some are even only gray in the middle. I find all of this very counter intuitive, and I assure you nobody is secretly dying my hair. How…
Jeff Axelrod
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Is antivenom fatal?

Antivenom is used for curing snake bites. Is it fatal when used without being bitten by a snake?
ihvvgh
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How do I get the current "camera position" in PyMol so I can reuse it in scripts?

I have a few protein models I want to take pictures of with various ligands bound. It would be nice if I could do it from the same "position", but the only way I can figure out to repeat the same view is with zoom resi. 64, 152, 150 or the like,…
Nick T
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How do members of cryptic species know who to mate with?

According to Wikipedia: In biology, a cryptic species complex is a group of species which satisfy the biological definition of species—that is, they are reproductively isolated from each other—but whose morphology is very similar (in some…
Douglas S. Stones
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What is the meaning of multicellularity?

I can't understand what multicellularity is. Wikipedia states that any organism having many cells is multicellular. By this definition bacteria can also be multicellular. For example, cyanobacteria can form filaments made up of specialised cells…
degmez
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What kind of bird species is this?

Every now and then I got a glimpse of this bird which I'm pretty sure is not native to Northern Germany where I live. There are at least three of these birds around but I usually only see something quick and green somewhere in the trees. I finally…
Christian
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Are there neurons that can sense light shining in your ears?

I know someone who bought earphones that shine light in you ears. According to what he was told, there are neurons that sense light and then make you feel wide awake when activated, which seemed like snake oil to me. Apparently the pineal gland may…
Ultimate Gobblement
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Fibonacci sequence in nature, truth or just wishful thinking?

I'm reading a bit on the Fibonacci sequence in nature, be it the golden ratio or the golden spiral forming over and over again in biological structures, and then I came across this online article by Donald E. Simanek, refuting a lot of these…
Ben
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What is this creature I found on my house?

What is this creature and what species is this? I found this on my balcony.
Batsal
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Can a color-deficient person be made to visualize the missing colors?

Hope this is within the scope of this site. Color-deficient persons lack the cells in their retina needed for differentiating some (or all) colors. However, the part of the brain that actually processes images is not deficient. Is it possible to…
Jus12
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What insect is this? (Central Africa)

I live in Africa (DR Congo). Here we have these insects that look like ants. They appear between May and June. These insects give severe damage if crushed on the skin. They contain something like acid that burns the skin. I saw many people wounded…
esQmo_
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Spruce growing high up in a maple trunk: Can a partially rotted trunk completely sustain another tree?

I've come across a spruce tree that is growing 15ft up in the crotch of a sugar maple tree: According to Google StreetView, the spruce has been there since before 2007 (over 10 years ago!). I've seen other trees growing out of rotted stumps or in…
User1974
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Can plants produce oxygen at night (without light)?

I accidentally clicked on a "Top n X's that Y" result in google and found Top 9 Plants that gives (sic) off Oxygen at night as well (best for indoors). In this helpful answer I've found a nice, concise description that I'm just going to reproduce…
uhoh
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Can you bleed from your bones?

I was talking to my science teacher about the body specifically the red bone marrow. She said that blood is created in the red bone marrow. Does that mean that if you were to cut a fresh bone open it would bleed?
Dragon born
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Why is thymine not incorporated into mRNA?

I am aware that in transcription uracil bonds to adenine and not thymine. But what is it that actually prevents thymine from bonding to adenine in transcription, that is not present in replication?
Benjamin Rogers-Newsome
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