r/ScienceNcoolThings

How do honeybees navigate a big city? 🐝

When a forager bee discovers a patch of flowers, she returns to the hive and performs a precise series of movements that tells other bees the direction, distance, and the quality of the food source. The forager bee can even give exact angles relative to the sun’s position! With brains no bigger than a poppy seed, honeybees can accurately locate the exact flowers without ever being led there.

What happens when you push a lit sparkler through an egg? 🥚🧨

In this experiment, Alex Dainis explains why the sparkler doesn't fizzle out and keeps burning straight through the egg. Most fires rely on oxygen from the surrounding air, sparklers are self-oxidizing. They release the oxygen needed to keep the reaction going, even inside the egg. That's also why you can't simply blow a sparkler out!

The satellite was successfully launched aboard an Ariane-1 rocket from French Guiana on June 19, 1981

Ketchup, relish, and mustard walked into a microscope! Our friend Chloe Savard, also known as tardibabe on Instagram, is back to show us the fascinating microscopic world hiding inside your favorite condiment trio.

Under polarized light, ketchup transforms from a humble staple into a dazzling constellation of suspended particles. What you're seeing is the colloidal suspension that gives ketchup its characteristic texture: tomato cell wall fragments, pectin networks, spice particles, and insoluble solids interacting with polarized light according to their optical properties and internal structure. That riot of color isn't artifice, it's physics. Together, these microscopic structures reveal the complex journey from raw tomato to the smooth, familiar condiment on your plate.

Relish may be an overlooked condiment on the table, but under the microscope it's anything but simple. What you're seeing is a world of cucumber cell wall networks, their honeycomb architecture remarkably intact even after pickling, alongside drifting plant fibers, suspended spice particles, and brine droplets refracting light into iridescent halos. Those four-petaled Maltese cross patterns? That's birefringence, the optical signature of crystalline starch granules interacting with polarized light. Humble hot dog topping. Extraordinary microscopic universe.

Mustard can pack a punch and that holds true at the microscopic level. That vivid yellow fragment at center is a piece of mustard seed tissue, its color coming from curcumin in the turmeric used to make yellow mustard. Surrounding it is a complex emulsion of ground seed husks, starch granules, and oil droplets, while those deep indigo-black streaks are seed coat fragments rich in pigmented phenolic compounds. Mustard's signature heat and pungency come from a chemical reaction between myrosinase enzymes and glucosinolates released when mustard seeds are crushed, and the visual complexity you're seeing under the lens reflects just how much chemistry is packed into every squeeze.

Three condiments. Three completely different chemistries. One very satisfying rabbit hole. 🌭🔬

How many red, white and blue LEDs can you light up with 250 coins?

Alex Dainis built a battery using 250 coins, electrolyte-soaked paper towels, and parafilm, generating an impressive 18 volts. But high voltage isn't everything. The long battery also had so much internal resistance that it couldn't deliver enough current to light an LED. By splitting it into several smaller batteries, each producing about 3 volts, she reduced that resistance enough to light all three LEDs.

Does this nebula violate the law of the speed of light? 🎆⭐️

Astrophysicist Erika Hamden explains that the“Fireworks Nebula” is a nebula that surrounds a binary star system, one of which occasionally puts out a ton of light in a nova explosion. In 1901, astronomers observed this for the first time and assumed the nebula was getting bigger faster than the speed of light. What was really happening was a “light echo” where the light bounces off existing structures. While this does give a cool firework effect, it does not break the law of the speed of light!

This project is part of IF/THEN®, an initiative of Lyda Hill Philanthropies.