The Brazil nut effect is a common name for the phenomenon where large particles tend to rise to the top of a mixture when it’s shaken. It’s also the subject of the latest FYFD video, which you can see above.

I’ve seen other mentions of the topic previously, but when I started researching the literature, I discovered that the Brazil nut effect was much more complicated than I’d thought! Hopefully, you’ll find the results as interesting as I did. And if you want to dig further, there are links to the papers I used over on YouTube.

Filming was also interesting this time around. I tried out stop-motion animation for the first time. It takes so much patience! But I think the results are so cute. (Image and video credit: N. Sharp/FYFD)

Awesome Women in Science

For International Women’s Day I thought I would compile a list of some of the cool women on this website! (There are so many so I am bound to leave off a bunch… please add to this)













3k Follower Blog Recs

Thank you all so much, I never thought I’d get 3000 followers oh my gosh >//<

Here’s a list of stim, calming, cleancore and kidcore blogs I follow and I recommend them all!


@nohandsnopokes @cryptidslime @bubbleclouds @napstablook-stims @chelliot-stims @snoozystims @stim-bat @thewoodsoflight @purplestims @stimbby @raiincat @nightstim @stims-inc @foodiest-stims @machinestim @whimsicalstim @pickystims @stem-stims @justfoodvideos @echolalia-a-a-a-stims @phanttump @purepastry @sparklystims @blushplace @trypophobestim @cute-stims @noslimestim @study-stims @visuallypleasingstuff @positivelystimming @baptap @chwy @slime-goth @paint-girl @ponystims @bumblethump @battyscave @stim-math @autistic-werewolf @fidgettoy @punkrockstimming @body-stim-posi @pastelgothstims @handsfreestim @chewing-and-stimming @chewychewychewychewychewy @softautistic @pineconestims @prismaudio @rainbowasmr @sillystimming @floamomatic @stimthings @frostingstim @lionstims @diystimtoys @sensoriies @autistims @starstims @sensoryboy @serenestims @gooeychewy @stimmykitten @stymmy @stimwithoutshame @calminglion @softandslime @stimblog4567 @sensrie @spokenfir @slime-time @dontyouputitinyourmouth @stimmy-stim-stim @stimkidd @stimmingsensation @princesslime @chickpeastims @sensoryseeker @glitter-gloo @stimmingkiddo @stimmythingies @purelyslime @stimsound @stimtendo @stimmysensoryfun @stimmyart @should-i-eat-that @visualstimz @sensxry @sensorys @stufficouldchew @soothingdoll @sensoriess @goopzone @slimegalaxies


@strawberrifrost @yoyothericecorpse @butteryplanet @okay-pause @ufo-the-truth-is-out-there @saku-petta @troominmoll @bubble-snowflakes @etoranze @algae-eater @artistry-engraving-and-embossing @allofceramics @chillanimebeats @puppysoft @prettysatisfying @fuckyeahfluiddynamics @garethwashere @eo-nni @camilladerrico @thecomfy-corner @coralmorphologic @absolutehellgod @harpsona @badtextures @jjjjjjjjjjohn @softofficial @prettypastelfoods @naturegifs @livingstills @tokkeki @foundandchosen @yukami  @thingsorganizedneatly @earthstory @bijoux-et-mineraux @super-cluster

Resources/Autistic/Neurodivergent related

@dateaneurodivergentwho @asdmemory @autisticliving @autisticlifehack @autistic-google @afterhoursautism(nsfw/18+) @anxiousautie @resourcesofasapphicautistic @verbal-stim-of-the-day @stim-safely @stimreferenceblog @fidgeteen @autisticcooking @sensorysurvival @autisticconfessions @autisticandpoor @littleautismthings @autisticliving @explainingthejoke @thatautismfeel


@freshchemicals @cleancoregifs @comfort-care @foamingbubbles


@blubunnicutie @smalltown98 @babydreams2002 @lullaby-bunny @pooh-bearz @sharkpup @leaf-kid @petitpomme @0461 @sofftboy @tobyterrier @kaijuice @litebrite2003 @carnival-toys @horsies @keikos-safe-place @p0tionmaster

anonymous asked:

New fan here. Can you suggest me other math and science blogs? Thanks

sure thing my b













































go here for more


It’s only fitting to take a moment to look back at 2014 as we step into the New Year. It was a big year in many respects - we hit 1000 posts and broke 200,000 followers; I started producing FYFD videos on our YouTube channel; and, on a personal note, I finished up my PhD. But since we’re all about the science around here, I will give you, without further ado, the top 10 FYFD posts of 2014:

1. Bioluminescent crustaceans use light for defense
2. What happens when you step on lava
3. Flapping flight deconstructed
4. Wingtip vortices demonstrated
5. Saturn’s auroras
6. Raindrops’ impact on sand
7. Water spheres in microgravity
8. The surreal undulatus asperatus cloud
9. Inside a plunging breaker
10. A simply DIY Marangoni effect demo

I can’t help but notice that 9 out of the 10 posts feature animated GIFs. Oh, Tumblr, you rascals. Happy New Year! (Image credits: BBC; A. Rivest; E. Lutz; Nat. Geo/BBC2; ESA/Hubble; R. Zhao et al.; D. Petit; A. Schueth; B. Kueny and J. Florence; Flow Visualization at UC Boulder)


This kicked ball curves like you’ve never seen a ball curve. Can science (or David Beckham) possibly explain this? Awesome video from Physics Girl, featuring @fuckyeahfluiddynamics!


Last night I walked across the stage as a student for the last time, receiving my PhD in aerospace engineering and getting hooded by my advisor in a tradition with roots back to medieval scholars. Even more so than the defense, it marked an official end to my PhD. None of that is really fluid dynamical, but I wanted to use the opportunity to thank each and every one of you who read and support FYFD. This blog began on a whim while I was a graduate student waiting for an opportunity to do the experiments I needed. I never could have predicted at the time the impact it would have on my life. FYFD became a part of my daily life, and thanks to you, readers, it became a source of inspiration and motivation for me as I pursued my studies. I have learned so much more about fluid dynamics in writing FYFD and answering your questions than I would ever have on my own. I have had opportunities to travel, to communicate and even meet with people from all corners of the globe who share some of my enthusiasm for the subject. It has been a wonderful experience so far, and I hope for many more ahead. Thank you all for being a part of it! (Photo credit: J. Mai)


Next week marks FYFD’s 4th birthday! It’s hard to believe that it’s been so long, or that the blog and I have come so far. I set out with the intention of explaining fluid dynamics to a broad audience because it’s a subject we all experience daily and yet one that few learn formally. (I also, as you may have guessed from the blog’s name, didn’t take things too seriously.) Many things have surprised me these past four years, but one of my favorites is how much I’ve learned. In researching and writing FYFD, I am constantly learning new and fascinating physics. I love it every time something new stuns me with its beauty, its cleverness, or its jaw-dropping, mind-blowing awesomeness. In celebration of that feeling, next week’s posts will revisit some of my favorite subjects, especially those that did and do amaze me. In the meantime, try not to let the ice cream melt. Unless you’re into that. (Video credit: I. Yang; submitted by Stuart B.)

Off on a vacation

Hey guys,

Tomorrow (October 14), I’m heading off on vacation for a couple weeks out of range of the Internet. I’ve queued up entries for while I’m gone and my friend Claire from Brilliant Botany (check it out!) has kindly agreed to watch over the Tumblr queue and make sure it posts like it’s supposed to. So you should hopefully experience no interruptions to regular posts. But I won’t be responding to asks, submissions, emails, etc. until after I return at the end of the month.

Have a lovely October, readers! I’m off in search of penguins and iguanas.