Bioacoustician Bernie Krause has recorded the amazingly rhythmic vascular systems of thirsty trees:
He discovered that the cells in the xylem and phloem of the tree fill with air to try to maintain the osmotic pressure that's usually produced by the sucking of water up through the roots. At a certain point the cells burst. Krause adds "When they pop, they make a noise: we can't hear it, but insects can. And when insects hear multiple cells popping, they're drawn to the tree because certain ones are programmed to expect sap. And when the insects are drawn to the tree, the birds are drawn to the tree to eat. it's all a microhabitat formed by sound: The sound of popping cells." (Incidentally, when the xylem cells pop, they die and form the rings of the tree). Recordings are made at their natural high frequency (about 47 kHz!) with a hydrophone and then slowed down by about a factor of seven.
Bernie's done some fascinating work in the field of "biophony", which is based around the idea that every animal in an eco-system has its own acoustic territory, or bandwidth of sound that it vocalizes in. If something comes in and takes over a certain bandwidth (like the regular route of a noisy airplane) entire populations can suffer, or be forced to adapt.
Caltech theoretical physicist Sean Carroll, author of Something Deeply Hidden: Quantum Worlds and the Emergence of Spacetime, explains the concept of a “dimensions” at five different levels of complexity. Dr. Carroll sure has a big brane.
In 1936, the Tasmanian tiger (Thylacinus cynocephalus) was declared to be extinct. Yet in the last three years, there have been eight reported sightings according to Tasmania’s Department of Primary Industries, Parks, Water and Environment. I hope it’s true. From CNN: While stories abound that some continue to live in the remote wilds of Tasmania, […]
Who doesn’t love a free meal? From Nautilus Live: During the final dive of this year’s Nautilus expedition season, our team discovered a whale fall while exploring Davidson Seamount off central California’s coast with researchers from Monterey Bay National Marine Sanctuary. The skeletal remains of the whale lying on its back are estimated to be […]
We can’t all go through life with just a pair of sneakers and flip-flops. Sometimes, you have to invest in a pair of high-quality dress shoes. However, you’ve probably discovered that high-end footwear almost always comes with eye-popping price tags. You’ve got to compromise on second-hand or just suck it up and take out a […]
We have a theory about those throw blankets that are barely big enough to cover your legs. The only people who seem to make them or use them are grandmothers, and the blankets are only that small because Nana got bored halfway through the sewing job. Look, we’re sure she means well. But if you […]
Remember when the default state of your online presence was anonymity? That’s not so clear-cut anymore, and the worst part is you may not even know who is using your data or what they’re using it for. Small wonder that so many people are choosing to surf through virtual private networks. VPNs filter web access […]