Who knew that the moon’s orbit wobbled on an 18.6-year cycle? Well, actually, we’ve known about this since 1728—and Bronze Age peoples knew about it thousands of years ago, and tracked it in their megalithic monuments all over the world.
But a paper in Nature Climate Change this week studied the impact it will have on high tide flooding in the coming decades. Right now we’re approaching the major standstill, where tides variation is the lowest, hiding the impacts of sea level rise on coastal flooding. In 2034, we’ll be at the minor standstill, which exacerbate the flooding.
he tells it again
walking home from the bar—
In a study out of Yale this week, researchers explored the neurological pathways governing a fly’s choice in what to eat—is it the taste or the calories they’re after?
To explore this, scientists laced a normally sweet, nutritious food with bitter quinine, and watched the flies brains as they decided whether to eat that, or another food that was sweeter, but lower in calories.
In the end, it mattered how hungry they were. If the flies were hungry, they chose the bitter food with more calories, but if they were satiated they chose the sweetness, suggesting even in a fly there are multiple pathways governing these decisions—the gut’s needs can override the brains dopaminergic reward system.
While it’s not mentioned in the study, I can’t help but think this is the answer to the mystery of why artificial sweeteners don’t help people lose weight. Diet soda satisfies the reward system with a hit of sweetness, but does nothing for the body’s deeper craving for calories. So we drink diet soda, then eat more, and it makes no difference to calorie intake.
This doesn’t mean we aren’t better off drinking diet soda, as simple sugars are inflammatory at these high doses, and lead to diabetes and other health problems—and are kind of the opposite of chemotherapy, when you think about it, feeding tumor growth. But don’t expect to lose weight.
on fallen fruit
I almost forgot to share this week’s sciku! It was inspired by researchers at Stanford and TU/e who have been studying how hummingbirds hum.
If you’ve spent any time watching hummingbirds, you might already know they answer: they don’t fly like regular birds that apply aerodynamic force to the undersides of their wings with every down-stroke. Their wings move back and forth horizontally, letting letting them hover like a helicopter. This motion creates pressure fields on both the up and the down strokes, and those fields of compacted air oscillate back and forth at 40 hertz, creating their iconic and soothing hum, rather than an annoying buzz.
What was interesting about this story, though, was the great pains the researchers went through to record the hummingbirds and then process the data. Over the course of four days, they filmed with 15 high speed cameras, over two thousand microphones in a “sound camera” array, and recorded the movement of air with a series of pressure plates. Then it took THREE YEARS of machine learning AI to process and synchronize the massive amount of data that was collected.
There’s a cliched joke about scientists wasting time and grant money studying whale burps or the way cheese melts on toast. But it’s often the challenges that come with solving any problem—even a mundane problem—that lead to new advances. In this case, the sound camera technology that was developed will be used to decrease the background noise created by drones and fans, and ultimately could make all of our appliances quieter. Wouldn’t that be nice?
heavy in the field
In science news this week, researchers at the University of Lund put a butterfly in a wind tunnel for the first time to study the aerodynamics of their flight. It’s often been assumed that their flat floppy wings were an inefficient way to fly, but nature is often more than what it seems.
It turns out that the clapping action of their wings shoots a jet of air backward, propelling them 28% faster than they’d be able to fly otherwise. Yes, like jetpacks!
These short bursts of irregular motion make them much more difficult to catch as prey for swooping birds. Predicting where the butterfly will be as they strike is like a batter trying to hit a knuckleball. Which should be no surprise—baseball players like Willie Stargell have long compared hitting the pitch to catching a butterfly with tweezers.
It’s another great lesson from nature about the quality of our assumptions.
answers to the question
of one hand clapping
This week’s sciku takes me back 20 years to my job as a group home counselor. We were trying to help adults with schizophrenia manage their lives and illnesses more independently, but the medication, which was so necessary, also made it difficult.
Antipsychotic medication needs cross the blood-brain barrier to work, but when you swallow a pill, only a small fraction makes it through. As a result, the effective dose is much larger than it would be otherwise, leading to very unpleasant side effects—from weight gain and fatigue to diabetes and eventually organ toxicity. Many patients had to take multiple drugs hoping to counteract the side-effects. And once they found a combination that worked, it would only last a while before they had to start over with an entirely new regimen due to the accumulating toxicity. It was rough—but still better than the hell of psychosis.
So I was thrilled to learn that researchers at McMaster University have developed a nasal spray using extremely fine particles of corn starch to deliver antipsychotic medication more directly into the brain, sneaking it through a hidden door along the olfactory nerve. The corn starch breaks down into simple sugar, but gradually, allowing it to be time-released with a 75% lower effective dose. Instead of taking medication multiple times each day, patients will only have to use a nasal spray once every three days, with far fewer side effects. The difference this will make for people’s quality of life is huge.
And that’s what I love about reading science news. Unlike what we call “The News,” where negativity bias is exploited for clicks, science incentivizes the good—it’s mostly mysteries solved, problems fixed, new questions to ponder. And there’s something new every week. This time with a bonus one-liner.
the men line up
for their meds
more drizzle than mist refilling the pill box