STEMRoll

STEMRoll STEMRoll.com offers apparel and accessories inspired by the brilliance of STEM.

Curating innovative designs across science, technology, engineering, and mathematics, we bring creativity to life for students, enthusiasts, and professionals alike.

A reef-building coral is an animal that farms an alga.Single-celled algae called zooxanthellae live inside the coral's o...
08/31/2026

A reef-building coral is an animal that farms an alga.

Single-celled algae called zooxanthellae live inside the coral's own tissue. They photosynthesise and, by NOAA's figure, can transfer as much as 90% of the organic material they produce to their host. In return they get shelter and nutrients. That trade is what lets reefs build enormous structures in water that is otherwise nutrient-poor.

Bleaching is what happens when that partnership breaks down: the coral loses its symbiotic algae, or those algae lose their pigments, and the white skeleton shows through the translucent living tissue. Heat stress is the major modern trigger, though it is not the only one.

A bleached coral is stressed, not necessarily dead. Ease the stress soon enough and it can recover.

stemroll.com/go/reeflaxing-fb

Put MEAN under the peak of a bell curve and you are telling the truth — for that curve.On the theoretical normal distrib...
08/31/2026

Put MEAN under the peak of a bell curve and you are telling the truth — for that curve.

On the theoretical normal distribution the mean, the median and the mode all sit at the same point. That is a property of the distribution, not of data in general. Even a real sample drawn from a normal population will not have all three exactly equal.

Change the shape and they separate for good. Add a long tail on the right and the mean gets dragged toward it while most of the data stays behind. That is one reason earnings are usually reported as a median: a handful of very large values move a mean and barely touch a median.

The joke works. So does the caveat.

stemroll.com/go/meangenius-fb

Marie Curie is still the only person to win Nobel Prizes in two different sciences — Physics in 1903, Chemistry in 1911....
08/30/2026

Marie Curie is still the only person to win Nobel Prizes in two different sciences — Physics in 1903, Chemistry in 1911.

She and Pierre discovered polonium and radium. During the First World War she built mobile X-ray units, nicknamed "little Curies", and drove them to field hospitals so wounded soldiers could be imaged before surgery.

Her notebooks are still radioactive. They're kept in lead-lined boxes, and you sign a waiver to read them.

The shirt reads "Curieous about ideas" — after her own line about being less curious about people and more curious about ideas.

stemroll.com/go/curie-fb

Take, make, dispose. That's the linear economy, and it's the default almost everywhere.A circular economy closes the loo...
08/30/2026

Take, make, dispose. That's the linear economy, and it's the default almost everywhere.

A circular economy closes the loop: products designed for longevity, repair, remanufacture and recycling, so material value stays in use instead of ending up as landfill.

The interesting part is that most of it is settled at the design stage, years before anyone throws anything away. Whether a thing can be repaired is a choice somebody already made for you.

stemroll.com/go/circular-fb

Two different ways to work out what a molecule actually is.NMR puts the sample in a magnetic field and listens for nucle...
08/30/2026

Two different ways to work out what a molecule actually is.

NMR puts the sample in a magnetic field and listens for nuclei resonating. Where a peak lands depends on the electronic neighbourhood around that nucleus, so the spectrum maps the skeleton.

IR shines infrared through the sample instead. Bonds vibrate at characteristic frequencies, so a broad bump near 3300 says O-H and a sharp one near 1700 says C=O.

Shifting peaks and feeling vibes. The pun is doing real work.

stemroll.com/go/spectroscopy-fb

IP23 means protected against solid objects larger than 12.5 mm, and against water sprayed from up to 60 degrees off vert...
08/30/2026

IP23 means protected against solid objects larger than 12.5 mm, and against water sprayed from up to 60 degrees off vertical.

Translation: fine in light rain, absolutely not fine in a puddle. Your phone is rated IP68 — dust-tight and good for sustained immersion. You are not.

First digit is solids, second digit is liquids. You'll never read a spec sheet the same way again.

stemroll.com/go/ip23-fb

Fungi wrap around tree roots and trade with them: sugar from the tree, phosphorus and nitrogen from the fungus.That part...
08/30/2026

Fungi wrap around tree roots and trade with them: sugar from the tree, phosphorus and nitrogen from the fungus.

That partnership is real, ancient, and under most forest floors. The part still argued over is the popular version — trees deliberately sending food and warnings to each other through a shared fungal network. A 2023 review found the field evidence for that a lot thinner than the story suggests.

Good science is allowed to be unfinished.

stemroll.com/go/woodwideweb-fb

Fire, farming, and the wheel are on the cover for a reason. Those three are the hinges history turns on.Controlled fire ...
08/29/2026

Fire, farming, and the wheel are on the cover for a reason. Those three are the hinges history turns on.

Controlled fire made food safer and released calories our guts no longer had to work for. Farming let a population stay in one place and grow past anything foraging could support. And the wheel was close to useless until someone paired it with a fixed axle -- the axle is the hard part, not the circle. Three ideas, and everything after them.

stemroll.com/go/foundations-fb

Your brain runs on about 20 watts, roughly a dim lightbulb.It is about 2% of your body mass and consumes around 20% of y...
08/29/2026

Your brain runs on about 20 watts, roughly a dim lightbulb.

It is about 2% of your body mass and consumes around 20% of your energy budget. Every thought you have ever had, on less power than the lamp on your desk. Nothing we have engineered comes close to that efficiency.

stemroll.com/go/20watts-fb

Every building you have ever walked into was somebody's calculation.Structural engineers work out exactly how much load ...
08/28/2026

Every building you have ever walked into was somebody's calculation.

Structural engineers work out exactly how much load a thing can take before it fails, then design so it never gets close. Eiffel, Fazlur Rahman Khan, Emily Warren Roebling, Zaha Hadid — the skylines we take for granted are their arithmetic made physical.

stemroll.com/go/strength-fb

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