#10. Touch-Me-Not Seed Pot Exploding
Some plants have figured out astonishing ways to reproduce, including the jewelweed (Impatiens capensis), also known as the spotted touch-me-not. When the seeds mature enough to start a new generation, their pods develop a nastic response and explode, dispersing the seeds in the environment. When the time comes, the cells of the seed pod accumulate and store mechanical energy based on their hydration level. Any external stimuli then overloads the system, and the walls separate and quickly coil up on themselves, transferring energy to the seeds and launching them outwards. This study from the Journal of Experimental Biology explores how this mechanism works.
#9. Pine Cone Opening
When it’s dry outside, pine cones open up to disperse seed. When it’s damp, it’s no longer a favorable condition, so they close to protect them. Pine cones are the most common example of a hygromorph, which changes shape based on humidity levels. The cells inside the cone are dead, and the triggered response is completely automatic. When they’re dry, a small section of the outer layer of the scale near the mid-rib shrinks, pulling the whole scale back and opening it up. When it’s damp, the moisture causes the layer to expand in such a way that it closes the cone. Here is a detailed study on the subject.
#8. Water Transfer Printing
Water printing, a.k.a. hydrographics, is a fast and efficient method to coat an object. The hydrographic film is first placed on the surface of a tank with water. The film itself is soluble in water, so after a short time, it dissolves, leaving the ink calmly floating on the surface. The item is carefully dipped inside as to accurately transfer the texture and details of the film. A swirling motion disperses the ink to ensure the texture stays perfectly printed. The object then needs to dry and get a clear coat finish, just like any other printing process. Here’s a Q&A about water printing.
#7. Ants Acting As A Fluid Or A Solid
Ants, being the social bunch they are, figure out that by grouping and acting like a single body, they can counteract external forces very effectively and, as a group, adapt to a variety of situations. By latching themselves to each other, they can create a single solid mass that’s elastic and springy in nature. This, for example, allows them to endure a big push, which would otherwise throw off a single ant. When they need to be more flexible with their surroundings, they simply move around within the body of ants and it allows them to act as a fluid and easily overcome obstacles. Take a look at this great production by the New York Times.
#6. Divers Upside Down Under The Ice
When you notice that the air bubbles “fall down,” you’ll realize these divers are actually walking upside down on the underside of the ice on a frozen lake. This becomes possible when they inflate their gear with air, which increases their buoyancy and makes them go up. A little fine tuning, and they can simulate gravity upside down. They can do that as long as they have air in their bottles, because the water pressure around them is supporting their entire bodies from all sides. Watch the original video.