This week on the channel +1.3M views this week

Steve Mould's tumbling beads arrange themselves into flowers

His sole upload brings Manchester researchers into an investigation of why mixing grains can separate them instead.

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Steve Mould Story of November 1, 2026Trari Newsroom

Why this story? The channel's weekly summary: what went up this week, what is drawing views now, and where the channel stands among similar channels.

This Material Sorts Itself

Things we can learn from the video

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0:52Different bead sizes, rather than different densities, drive the separation shown in the drum.
3:04A motorised model shows how shearing pinches larger beads upwards without letting them fall back.
6:22Repeated avalanches create striped bands, resembling patterns in sandscape toys.
7:13Petal formation in half-filled circular drums depends on surface friction and rotational timing.
10:16Shaking a tray makes larger particles gather into distinct clusters.
14:17Chris Johnson helps examine why a pentagonal drum at a particular fill level fails to produce symmetry.

Turning a drum ought to mix its contents. Steve Mould's glass beads have other ideas: they separate by size and arrange themselves into flower-petal patterns, provided the drum is exactly half full.

"This Material Sorts Itself", his only upload this week, reached roughly 667,000 views in its first fifteen hours. Mould makes the puzzle visible with tilting frames and a motorised model, showing how larger beads get pinched upwards as particles slide past one another. "It's a bit like a ratchet," he explains. "The large beads are pinched upwards, but they can't fall back down again..."

The investigation extends from striped avalanches to clusters on a shaking tray. University of Manchester researchers Chris Johnson and Nico Gray helped with the work, and Johnson joins by video call for the awkward case of polygon-shaped drums. A pentagon doesn't always produce the symmetry you might expect. The video ends with a sponsored razor segment.

Viewers pick up on Mould's recurring use of transparent sandwiches to expose hidden physics. Others compare the moving bead layers with caterpillars crawling over one another, or connect the clusters with other physical effects. One commenter describes ingredients separating during pharmaceutical-manufacturing research, a practical echo of the video's mixing problem.

Across the channel, the week brought about 1.3 million views and an unchanged subscriber total. Daily viewing is a little below its usual level; nearby science channel Technology Connections is having a pronounced surge. Mould's new bead demonstration is his busiest upload right now, with "Hooded Seals are Really Weird..." and the transparent ram-pump investigation supplying the strongest momentum among the older videos.

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What viewers say

we had this problem in our research on fine pharmaceuticals manufacturing. No one would believe that ingredients can unmix themselves, and yet. CMAC Glasgow.
@JurekOKSee it on YouTube
The bead avalanche moving looks eerily similar to how the large groups of caterpillars move faster together by crawling on top of each other in layers.
@danje748See it on YouTube
Thank god I can stop sorting my sand manually
@davidr2421See it on YouTube

5 more comments

Jesse, we need to sort!
@HiroshiNagaiiSee it on YouTube
The large bead 'islands' formed by little beads colliding but never acting to push adjacent large beads apart reminds me of the Casimir effect
@lynnmylahSee it on YouTube
You have such a great way to visually explain 'problems' it is absolutely incredible
@t1mmy13See it on YouTube
My life is chaos and some how it sorts itself out.
@JohnAltenburgSee it on YouTube
A hundred years from now someone will find some of those beads in your house.
@tk423bSee it on YouTube