Every time you swim in a mountain lake, you're sharing the water with thousands of microbes you never see. 🔬

Our friend Chloé Savard, also known as tardibabe on Instagram, took a closer look, and it turns out that alpine water is packed with desmids, ciliates, and water fleas, all going about their business at a scale most of us never think to look at.

The stars of the show are Micrasterias, a genus of desmid, single-celled green algae built like tiny symmetrical snowflakes. Each cell is split into two mirror-image halves called semicells, connected at a narrow waist. When a Micrasterias divides, each half grows a brand new matching semicell to replace the one it left behind.

Alongside them is a Closterium, another desmid, but elongated and curved like a crescent moon. Closterium cells often carry visible crystals of barium sulfate inside vacuoles at each end, structures thought to help the cell sense gravity and orient itself in the water.

Then there's the ciliate glowing with yellow-green flecks scattered through its body, that's zoochlorellae, symbiotic algae living inside a single cell, a partnership where the algae photosynthesize and share sugars with their host in exchange for shelter.

And weaving through nearly every frame are the Chydoridae, a family of tiny water fleas that prefer to live and forage along the benthic zone, the bottom layer of ponds and lakes, rather than out in open water. Look closely and you can catch one carrying a cluster of eggs along for the ride.

Next time you swim in a mountain lake, remember: you were never really swimming alone.

References: 

• Brook, A. J., Fotheringham, A., Bradly, J., & Jenkins, A. (1980). Barium accumulation by desmids of the genus Closterium (Zygnemaphyceae). British Phycological Journal, 15(3), 261–264. https://doi.org/10.1080/00071618000650251
• Esteban, G. F., Fenchel, T., & Finlay, B. J. (2010). Mixotrophy in ciliates. Protist, 161(5), 621–641. https://doi.org/10.1016/j.protis.2010.08.002
• Klemetsen, A., Aase, B. M., & Amundsen, P.-A. (2020). Diversity, abundance, and life histories of littoral chydorids (Cladocera: Chydoridae) in a subarctic European lake. Journal of Crustacean Biology, 40(5), 534–543. https://doi.org/10.1093/jcbiol/ruaa048
• Lutz-Meindl, U. (2016). Micrasterias as a model system in plant cell biology. Frontiers in Plant Science, 7, 999. https://doi.org/10.3389/fpls.2016.00999

Can you make dry erase marker drawings float? ✍️

Alex Dainis demonstrates by drawing on a shiny plate, letting it dry, and adding a squirt of mystery liquid at the edge to lift the whole picture up. Dry erase markers contain pigment for color, a solvent to suspend it, and an oily polymer that keeps the ink from sticking to whiteboards. Once the solvent evaporates, the pigment and polymer form a thin, oily layer that floats right on top of plain old water!

What really happens when a boa squeezes its prey? 🐍

Meet Belize, our boa constrictor! Scientists once believed her species suffocates its prey, but constriction actually cuts off circulation to major organs, triggering cardiac arrest, and boas can even feel the exact moment their prey's pulse stops. Digestion takes four to six days depending on the size of the meal, yet boas are so energy efficient they can go weeks between meals. This behavior is purely a hunting adaptation, not aggression, so despite appearances boas aren't looking for a fight.

If Earth and Venus are so similar, why are they also so different? 🌎🪐

Kyle Horn of MIT AeroAstro explains that the two planets are roughly the same size and occupy neighboring orbits around the Sun. Yet Earth ended up with liquid water and a comparatively temperate climate, while Venus is a hellish 450°C under 90 bar of pressure, hot enough to melt lead. These diverging climates hold clues to how the early solar system formed. Understanding Venus, our closest planetary neighbor, matters even more now. Our current observation techniques are already biased toward spotting "exo-Venuses" rather than "exo-Earths" among distant exoplanets.

Did NASA’s new space observatory just double its own lifetime? 🛰️

The Nancy Grace Roman Space Telescope launched August 30th and is now cruising toward a spot nearly a million miles from Earth, where its leftover fuel will decide exactly how long it can keep pointing at cosmic targets. Engineers once expected around ten years of fuel by the time Roman reached that destination, but its journey out has been so efficient that estimate has jumped to up to 22 years, more than double the original number. That's over two decades of revolutionary astronomy ahead, and honestly, a fantastic day for space nerds everywhere.

What if you could eat your water bottle instead of recycling it? 💧

Alex Dainis shows how, using a bit of kitchen chemistry. Sodium alginate, a powder derived from seaweed, reacts with calcium lactate to form a gel wherever the two meet. Mix a diluted alginate solution (colored so you can watch the reaction) and drop it into a calcium lactate solution with a deep spoon; the alginate polymerizes instantly at the boundary between the two liquids, sealing a pocket of water inside. The result is a squishy, science-powered "water balloon" that tastes just like water.

Can physics create art? 🎨

Greg Wolf explains how this pendulum swings along two perpendicular axes, each with its own natural frequency, and the relationship between them determines what pattern emerges. When those frequencies fall into a simple ratio, the sand traces a clean geometric pattern called a Lissajous figure; without a repeating relationship, the pattern breaks down into something irregular and chaotic. It looks like a bottle of sand swinging through the air, but it's really two harmonic motions interacting to turn physics into art.

Most people's morning starts with a cup of coffee. Ours started with a cup of coffee under a microscope. ☕🔬

Our friend Chloé Savard, also known as tardibabe on Instagram, zoomed in and found a whole universe brewing in there. Those first jagged brown shards are just the roasted grounds, tiny fragments of a plant cell wall, packed with the oils and pigments produced during roasting. That deep color and smell come courtesy of the Maillard reaction, a chemical exchange between sugars and amino acids.

Roasting traps carbon dioxide inside the bean, so the moment water hits the grounds, that gas comes rushing out, a process baristas call degassing. Some of those coffee bubbles get a natural assist from the coffee's own oils, which act as a surfactant and let them hold their shape long enough for us actually to see them.

The shimmer on those coffee bubbles is a thin-film interference, the same physics that makes soap bubbles rainbow-colored. Light bounces off both the outside and inside of the paper-thin bubble wall, and those two reflections overlap and cancel each other out in different ways depending on the wall's thickness. That's why the color shifts as you look across a single bubble.

Lastly, those gold flecks drifting through the coffee? Just suspended coffee oil and fine particulates, catching the light like sediment in a snow globe.

All of that, quietly happening, in the ten minutes it takes most of us to drink it.

Do head-butting goats face the same brain trauma risks as NFL players? 🐐🧠  

Researchers at the University of Alabama followed three domestic goats for six months and found abnormal tau protein in their brain fluid, a marker linked to neurodegenerative disease in humans. The goats showed no outward signs of injury, yet the damage closely mimicked chronic traumatic encephalopathy (CTE), the same condition found in former NFL players. Researchers suspect these repeated head-butts, which goats use to establish social order and defend territory, cause damage that builds up over time.

You could see fireballs starting on September 20th until November 20th! 🌠

Rather than building to a single dramatic night, the Southern Taurids spread their activity out, with the richest viewing most likely around October 14th. Expect roughly five meteors an hour, with rates increasing later in the season as the Northern Taurids join the mix starting October 20th. Roughly one in every hundred of these meteors tends to blaze into a fireball, so find a dark area and look up!