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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.

The first message ever exchanged between two hosts on ARPANET was two letters long: LO.29 October 1969. Charley Kline, a...
09/02/2026

The first message ever exchanged between two hosts on ARPANET was two letters long: LO.

29 October 1969. Charley Kline, a student at UCLA, was starting a remote login to Bill Duvall's SDS 940 at the Stanford Research Institute, with Leonard Kleinrock supervising and the two sites confirming each character by telephone.

He typed L. Then O. Then G — after which SRI's system was supposed to supply "IN" automatically. The failure happened as the G went in, leaving LO as the first successfully exchanged host-to-host text.

It was a software failure, not a typo. UCLA's account says the full login worked about an hour later.

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Io is the most volcanically active body in the solar system, roughly 400 active volcanoes with plumes hundreds of kilome...
09/02/2026

Io is the most volcanically active body in the solar system, roughly 400 active volcanoes with plumes hundreds of kilometres high, and its heat output is dominated by tidal heating rather than radioactive decay.

The reason is geometry. Io, Europa and Ganymede are locked in a 1:2:4 Laplace resonance: for every orbit Ganymede completes, Europa does two and Io does four. Those repeated gravitational nudges prevent Io's orbit from becoming perfectly circular.

An eccentric orbit means Io's distance from Jupiter, and so the tidal deformation Jupiter causes, keeps changing. The moon is flexed, over and over, and that flexing dissipates energy as heat until the interior melts.

A moon kept molten by its neighbours' timing.

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The gold chandelier in every quantum computing photo is not the processor.It is the dilution-refrigerator assembly. The ...
09/01/2026

The gold chandelier in every quantum computing photo is not the processor.

It is the dilution-refrigerator assembly. The actual quantum processor is a small chip mounted inside it, and all those gold-plated stages and coaxial lines exist to hold that chip near ten millikelvin — far colder than the 2.7 kelvin background of deep space — because thermal noise destroys the states you are trying to maintain. The fridge, the wiring, the control electronics and the chip together are the working machine.

And superposition is not "both answers at once" in the way it usually gets told. A qubit prepared in a pure state occupies one well-defined quantum state; what is probabilistic is the measurement outcome, which comes out 0 or 1 with probabilities set by that state and the basis you measure in.

The cat is optional. The refrigerator is not.

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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.

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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.

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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

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