I have seen these on my floor several times now that spring has arrived and temps have started to go up. It is silvery in color, appears to have a hard and segmented shell, it kind of reminds me of a lobster. They are very small, the dark line in the picture is the grout between two tiles on my floor for scale. I am guessing it is about three quarters of a centimeter in length. I am in Utah.
554
I am in Portugal (Lisbon) at the moment, and when leaving my room late at night (12 pm ~ 04 am) I usually face about 4 of these arthropods in the corridors:    (For reference, the "line" in the image is a standard separation on the floor. This particular example of the animal is a little smaller than a nail.) They seem to have quite variable sizes and walk primarily on ground. Also, as implicit above, they seem to be active primarily during the late night. (I don't see them much often, if at all, during the morning/afternoon.) They can be quite fast, but if left unharmed do not move much. They also appear to take shelter inside the walls.  From what I searched, it seems possible that they are centipedes. I've seen sites saying that they are useful to keep other less pleasant animals at bay. My questions are: What are those animals, and should I leave them be or not?
94987
Can anyone tell me what kind of insect (if it is one) is this...!! Or is it the pupa of some insect?  Well I don't think that the whole big thing is the insect itself, it appears to be just a kind of protection or shelter which moves along with the tiny little thing that keeps on popping out and going it so as to move. Location:  India
108969
At least I believe it's a chrysalis. I found it hanging from my gate the other day.  I'm in Western Arkansas:
58666
I just bought a house built in 1978 and I'm planning on putting tile in the bathrooms (currently linoleum).  The fixtures are removed and the flooring under the linoleum is particle board.  I think its 3/4".  It has a couple weak spots (one over a vent and the other around the toilet that was leaking).  I was planning on pulling this up and replacing with plywood and concrete backer board.  However, my question is, can I put 1/4" backer board over 1/2" plywood, so that the level of the floor is pretty close to where it was before and not have a large transition between the rooms?  -edit to add- 1 bathroom is along an outside wall of the house. 1 bathroom is in the middle of the house with a support beam running along one wall (beam runs the whole length of the house). Bathrooms share a wall in between them (total span of 10ft from outside wall to middle support beam of the house). Both bathrooms are on the 2nd floor. both bathrooms are above another heated/insulated room. 16in joist spacing. I don't know how big the joists are because I haven't removed the existing subfloor yet. We will most likely be installing ceramic tile.  My main goal here is to create the smallest transition as possible between the bathroom flooring and the carpet (installed on the same particle board) outside the bathroom.  If there are other options outside plywood + backer board that would be available, I am 100% willing to listen to them.
7700
I have found in a wooden house, in the mountains of central Spain this very curious insect:    I was wondering if that was its skin or whether it's decomposition or sand or saw-dust.  That particular region of Spain does have stink-bugs ... but this one doesn't look like anything I've seen before.  A google image search returns mostly arachnids ... but it seems to have only 6 legs.
12824
I've been having a problem with these problems for a week now so I thought I'd post it on MSE. Read the text below. . I've also typed it up:  Annabel made a shape by placing identical square tiles in a frame as shown in the diagram above. The tiles are arranged in columns. Each column touches the base but no columns touch the side or top. There are no empty gaps between columns. The frame can be enlarged as needed.  These are the questions. I've also typed them up.    A. Show that it is possible to arrange $7$ tiles so that the ant walks $8,9,10,11,12,13,14,15$ tile edges.   B. Show 6 ways of arranging 7 tiles so that the ant walks a total of 9 tile edges.  C. Show it is possible to arrange 49 tiles so that the ant walks a total of less than 21 tile edges.  D. Show four arrangements of 137 tiles, each arrangement with a different maximum height, so that the ant walks a total of 34 tile edges.  For question $a$, is there a formula relating the number of tile edges exposed to the number of tiles. These are my answers for $a$    For the above picture, it's the left hand side which has the $a$ answers.  However, I'm having a bit of trouble with $b$. I've already got four answers down but where are the other two. My four current answers are in the right hand side of the last image. Also, I'll also appreciate a formula to show the relationship.  I'm also having trouble with $c$. I found out that you get 21 tile edges exposes when you make a $7*7$ square but the answer is asking for less than 21. Can anyone help me. Also, as in the previous questions, a formula to show the relationships would be great.  And for $d$, I am totally lost. I have no idea where to start, and I certainly can't find out four arrangements. So can anyone help me? And as always, a formula is nice  P.S. Please explain this in an understandable formula, as I'm only a Year 7 with the ability to understand linear algebra and parts of quadratics and trigonometry. Also, sorry about the poor imaging.
31270
How should I start to show this. Can anyone give the specific steps?
35062
Any ideas? I didn't know any other way to explain it.  I live in Indiana, USA if that helps.   Someone said it might be a "stink bug" but I'm not sure and not willing to find out!
89025
Take a look at this symbol:   $$ \pi=3 + \underset{k=1}{\overset{\infty}{\large{\mathrm K}}} \frac{(2k-1)^2} 6 $$   Does it look familiar to you? If so please help me!
26192
I bought a tray of eggs recently. They aren't old, I have them in the fridge, and the date stamped on the egg says they are good for another month.  In two eggs that I cracked open today, there were dark green spots inside the shell (looked like mold maybe?), and floating around the egg white.   Any idea what that is? Is it a sign that the whole tray may be contaminated with something??  I only noticed the green on the shell after I mixed one of the eggs into a bread dough, and now I need to know if I should throw the dough out or not (it's a huge batch of dough).
115598
I found a a few of these guys on my composter, so they could have easily been eating bugs or decaying organics (or both):     To me it looks like a stink bug with oversized legs, not like the ones I'm used to seeing. His body measures just under 3cm, and I haven't pulled on his legs to get a measurement (I haven't pulled on it at all).  The legs seem to be at least 1.5 times the body length as do the antenna.  The body is grayish brown and the antenna and parts of the leg seem reddish brown.  I'm a microbiologist, so things big enough to see in a jar are not really my specialty.  That said, here's info that I've been trying to use ID it:  Wingless Normal compound forelimbs (don't seem to have any kind of   prey modification)    Segments filiform antenna (I think)   2 Tarsomeres (I think)   In the middle of South East US   Have had (unusually) heavy rains   Underside of the limbs and antenna seem red, but to seems gray  I've never seen it before! (and I usually notice such things).  Update: Despite my 4 year old putting other bugs and some leaves in with it, the bug died.  I took the opportunity to get some much better photos, and low and behold when I started manipulating it I was able to pull out a substantial rostrum that I missed!  These guys are good at hiding those.  So going back to assassin bugs, can anyone id which assassin bug it is?  More photos: [I would add more but I think this should be plenty]      I at least think it's quite a pretty specimen (to betray my mammalian aversion to bugs).
47550
As you can see at the bottom of the anvil are a little bit more shape down there, I am sorry I forget what you call them, but if some one could help me and get rid of them, that would be nice.
105391
What is the smallest possible value of  $$\left\lfloor\frac{a+b+c}{d}\right\rfloor+\left\lfloor\frac{a+b+d}{c}\right\rfloor+\left\lfloor\frac{a+d+c}{b}\right\rfloor+\left\lfloor\frac{d+b+c}{a}\right\rfloor$$  where $a,b,c,d&gt;0$?
108938
It was soft and covered in flies. My guess is fungi.  Location: South Florida.
18229
I live in Chapel Hill, North Carolina, and recently started seeing a bunch of these little guys in my house. They're about 1/8" long (estimate), with brown/black zigzag stripes; it's possible they're babies, but over the last two weeks their size has remained consistent so this seems unlikely.
118517
I found it in an old dictionary and I'm not sure what it means. It looks like the number &quot;3&quot;, but the top of the three has been flattened(and slightly curved). I've only seen this in three or four words. []
43717
I have seen these on my hands recently and I am wondering what they are. Urban Setting. South Central Pennsylvania.