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Topic: sand
What do sand dollars look like when they’re alive?
Pristine white sand dollars have long been the souvenir to commemorate a successful day at the beach. But most people who pick them up don’t realize that they’ve collected the skeleton of an animal, washed up at the e...
SpaceX Falcon 9 rocket launch, a time lapse at night
This is what an evening SpaceX Falcon 9 rocket launch from California's Vandenberg Air Force Base can look like. The 4K time lapse was filmed by photographer Jesse Watson from the Imperial Sand Dunes near Glamis, Cali...
The benefits of sea cucumber poop
There are about 1,250 different species of sea cucumber across the world's oceans. This is Thelenota anax. And yes, it's doing what you think it's doing. Sea cucumber poop is surprisingly important for the ecosystem. ...
Sicarius spiders self-bury in the sand
Sicarius spiders are a genus of 'six-eyed sand spiders' found in both South America and southern Africa. They're internet-famous for two things: Their venom and the way they self-bury in the sand. In the video above, ...
A colorful Chladni pattern demonstration
Watch as Chladni patterns form on a metal plate, a teaching demonstration "spiced up" with colored sand by associate professor of physics at UNC Charlotte skullsinthestars. The video is accompanied by Prelude from Sui...
Observing the angle of repose with DIY physics devices
The angle of repose or critical angle of repose is how steep various types of materials can be piled without slumping. The steepness of the side of a pile is determined by the amount of friction between the particles ...
How to collect black sand with a magnet
If you're ever at a beach with some black sand in the mix, run a magnet through the sand to see if the black sand sticks. Exploratorium educator Ken Finn demonstrates this experiment with a magnet and a plastic cup at...
What is dust made of?
Less than a tenth the size of an ant, a dust mite’s whole world is contained in the dusty film under a bed or in a forgotten corner. This realm is right under our noses, but from our perspective, the tiny specks of br...
Theo Jansen’s Animaris Mulus Strandbeest
It has an elephant-like trunk, or perhaps a toucan's beak, that helps stabilize its front. Wind-catching sails extend out from the sides like wings. Its front legs walk quickly and smoothly across the sand while its b...
Speed up geologic time with a DIY squeeze box
Build. Observe. Play in the sand and dirt. Making your own easy-to-build squeeze box is fun for lots of different reasons, including educational ones. This Science Snacks video with Eric Muller from The Exploratorium ...
Liquid Sand Hot Tub: Making a giant fluidized bed of sand
When air is pumped through sand in just the right way, the sand begins to behave a lot like a fluid. As air escapes between the sand particles, items placed in the sand will begin to float. Others will sink. And when ...
How sand swimming shovel-snouted lizards stay cool in the Namib Desert
Endemic to the Namib Desert, shovel-snouted lizards (Meroles anchietae) have learned how to survive in extreme conditions. They are fast, able to run at over 91.5 cm/3 feet per second. When they rest, they must carefu...
Poet on the Shore by Yuxi Liu
An autonomous robot rolls across the beach. Though it might stop moving, its sensors haven't stopped taking in information about its surrounding environment: the waves, the wind, the sounds of people and animals both ...
A pacific razor clam burrows rapidly into the sand
Watch as a pacific razor clam (Siliqua Patula) rapidly burrows into the sand with its large foot. When it's almost completely buried, it ejects spouts of water, a reaction that a variety of razor clams are known for. ...
Make Lissajous patterns with DIY sand pendulums or light
Sand pendulums are an easy and beautiful method for students of all ages to learn a bit about the harmonic motion. These devices are easy to build and can be adjusted to give a variety of patterns. A pendulum that beg...
The differences between a living and a dead sand dollar
How can you tell if a sand dollar is dead or alive? Sand dollars are flat sea urchins that burrow into the soft sand. When alive, their undersides are full of "velvet-textured spines" covered with cilia, a latin word ...
Humphead parrotfish poop helps create new island beaches
How can a hungry school of fish help to create a thriving reef island? In this clip from the BBC's The Blue Planet, neon-colored Humphead Parrotfish crunch rocks and hard corals alike as they forage for coralline alga...
A night adventure to see Nicaragua’s sea turtles
Conservation educator Phil Torres traveled to Playa la Flor and the surrounding waters in Nicaragua to document how Paso Pacifico is working to protect the sea turtles. From SeeTurtles.org: Along Nicaragua's Pacif...
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