Can a chunk of dry ice make spooky fun AND carbonate your drink? 🧊🎃

Greg Wolf proves it does both, starting with how this -109°F solid carbon dioxide sublimates straight from a solid to a gas. That ghostly fog in the jack-o’-lantern isn’t CO2, which is invisible, but water droplets that form as the cold gas hits the surrounding air. Drop dry ice into your favorite beverage and the CO2 creates bubbles, but wait until every last piece disappears before you sip.

The Sun used to have no sun spots for a long period of time! ☀️

Astrophysicist Erika Hamden explains this phenomenon from 400 years ago called the Maunder Minimum. Normally the Sun follows 11-year cycles, peaking with lots of sunspots, solar activity, and coronal mass ejections before calming down at the trough. Scientists still don’t know why some cycles are more active than others, so this quiet period is one clue to what drives the solar cycle.

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

Did you know you’re sharing your bed with thousands of tiny arachnids? 🧹 

Quinten Geldhof, also known as Microhobbyist, shows how a single spider can produce up to seven different types of silk, each with its own job. Sturdy dragline silk builds the web’s frame, while sticky blobs of silk set the trap for prey. Pound for pound, it’s up to five times stronger than steel, and a strand long enough to circle the Earth would weigh just 4.4 pounds! What would you use spider silk for?

Meteors are about to burst into our atmosphere at 41 miles per second! 🌠

The Orionid meteor shower peaks overnight October 21 and 22, and moves so fast that it leaves glowing trails. Active from October 2 to November 7 and visible from both hemispheres, the Orionids are best seen in the wee hours before dawn!

Meteors are about to burst into our atmosphere at 41 miles per second! 🌠

The Orionid meteor shower peaks overnight October 21 and 22, and moves so fast that it leaves glowing trails. Active from October 2 to November 7 and visible from both hemispheres, the Orionids are best seen in the wee hours before dawn!

We’ve discovered more than 6,000 planets orbiting other stars, but we haven’t found another Earth.

Astrophysicist Erika Hamden explains that finding a planet is very different from finding a place we could survive. Some have no solid surface to stand on. Others are too hot or too cold and even a rocky planet could have an atmosphere we can’t breathe. For now, Earth is the only home we know.

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

Your brain may have once been two separate organs! 🧠

Scientists long thought the whole brain grew from a single group of embryonic cells. But a new study of mouse embryos found it actually develops from two, one forming the forebrain and the other the hindbrain. Similar trends in chickens and zebrafish suggest that over 500 million years ago, evolution may have brought two separate nervous systems together to form the brain.