Archive for the ‘Video’ Category
Why are we alive when our bodies are constantly under attack from bacteria, viruses and more? As this video explains, it is thanks to our immune systems that we have an army of cells fighting for our cause.
There have always been and there will always be controversial ideas in Science.
Watch this clip to explore some controversial science and gain an understanding of cognitive bias at the same time.
We live in a world of unseeable beauty, so subtle and delicate that it is imperceptible to the human eye.
“Slow” marine animals show their secret life under high magnification. Corals and sponges are very mobile creatures, but their motion is only detectable at different time scales compared to ours and requires time lapses to be seen. These animals build coral reefs and play crucial roles in the biosphere, yet we know almost nothing about their daily lives.
“How fast are you moving?” seems like an easy question, but it’s actually quite complicated — and perhaps best answered by another question: “Relative to what?” Even when you think you’re standing still, the Earth is moving relative to the Sun, which is moving relative to the Milky Way, which is…you get the idea.
If you mix corn flour (corn starch) and water together you get a really funky liquidy goop. This goop is often called oobleck and it has some really cool properties. This video is a fine example of oobleck in action:
The reason the guys in that video can walk on the liquid is because it is a non-Newtonian fluid. In this case, corn flour is made up of very long molecules (called starch), so if you hit the oobleck hard the molecules get caught up on one another and provide resistance kind of like a solid. But if you just slowly push on oobleck you will sink into it because the long molecules will have a chance to slowly slide past one another.
By the way, if you have never made oobleck before I strongly recommend it. Just go the supermarket and buy some corn flour, then mix it with water until the consistency is … well, you’ll know when you have it. Enjoy
Your brain processes everything you see depending on what is surrounding it. Perception is everything …