This video, uploaded a year and a half ago, was submitted by Karen, who writes:
A short video of Oscar, an orphan river otter in the nursery at the Kentucky Wildlife Center. River otters are a true conservation success story in Kentucky. They were eradicated in the state in the early 1900s due to overharvesting (hunting and trapping), habitat destruction, and pollution. Kentucky Department of Fish and Wildlife Resources released 350 wild caught adults back into the wild in the 1990s. Blessedly, they have been making a comeback. Oscar was found abandoned, cold, hungry and dehydrated on the bank of a lake in Western Kentucky. He is now a permanent resident education ambassador at the KWC and is the only river otter in captivity in the state of Kentucky. He has a habitat that rivals any zoo or aquarium in the world, is happy and educates thousands of people a year.
NASA’s Lunar Laser Communication Demonstration (LLCD) has made history using a pulsed laser beam to transmit data over the 239,000 miles between the moon and Earth at a record-breaking download rate of 622 megabits per second (Mbps).
LLCD is NASA’s first system for two-way communication using a laser instead of radio waves. It also has demonstrated an error-free data upload rate of 20 Mbps transmitted from the primary ground station in New Mexico to the spacecraft currently orbiting the moon.
Opposing ultrasonic speakers can be used to trap and levitate droplets against gravity using acoustic pressure. Changes to field strength can do things like bring separate objects together or flatten droplets. The squished shape of the droplet is the result of a balance between acoustic pressure trying to flatten the drop and surface tension, which tries to pull the drop into a sphere. If the acoustic field strength changes with a frequency that is a harmonic of the drop’s resonant frequency, the drop will oscillate in a star-like shape dependent on the harmonic. The video above demonstrates this for many harmonic frequencies. It also shows how alterations to the drop’s surface tension (by adding water at 2:19) can trigger the instability. Finally, if the field strength is increased even further, the drop’s behavior becomes chaotic as the acoustic pressure overwhelms surface tension’s ability to hold the drop together. Like all of this week’s videos, this video is a submission to the 2103 Gallery of Fluid Motion. (Video credit: W. Ran and S. Fredericks)