Science Week — #10

Picture this: you’re walking across windswept badlands, and right there in the rock is a set of enormous footprints—four steps in a row—left by a top predator from the end of the dinosaur age. That’s our opening today, and it is such a window into a vanished world.

It’s a nice reminder that sometimes the most vivid science is literally imprinted in stone. And, welcome. This is episode 10, the science of the week for September 15.

We’ve got a full plate: deep time and dinosaurs, disease in deer and a newly confirmed mosquito in the Southwest, the nuts and bolts of how we map the continent, and a big week in space—from a Mars sample-return follow-up to a study suggesting Mercury may have shrunk more than we thought. Plus a look inside NASA’s own house as lab moves raise questions.

As always, we’ll separate what’s established from what’s preliminary, keep the claims in scale, and explain why it matters without the fireworks.

And we’ll keep the pacing humane. Let’s start with those footprints—because after a hundred years of T. rex headlines about teeth and bones, there’s a different kind of evidence on the table: the way an animal actually moved.

Paleontologists working on U.S. Forest Service land in southwestern North Dakota have identified a 7‑meter trackway—four adult Tyrannosaurus rex footprints in sequence—dating to roughly 66.5 million years ago. It follows earlier reports that this is the first continuous series of adult T. rex footprints ever recorded.

And that “in sequence” bit is key. A single footprint is a snapshot. Four in a row is at least a short film. You can see the spacing and orientation from step to step—what you called the way an animal moved, its stride.

There’s something quietly thrilling about that. It’s different from the showpiece skeletons. This is a trace of behavior—a moment of motion.

Methodologically, we should remember: this is one trackway, four prints. It’s valuable, but it’s a small sample. You can infer stride length from the distance between imprints, but not the full range of gaits or speeds for the species. Also, dating to about 66.5 million years is consistent with late Cretaceous rocks in that region; that anchors the context, not the individual’s biography.

Still, the first continuous series of adult T. rex footprints sets a baseline. If more trackways turn up, patterns could emerge. For now, it’s a rare data point that complements all the work from bones and bite marks.

Exactly. It’s a convergence story: anatomy, ecology, and now locomotion evidence, all pointing to a large predator on a real landscape. No hype needed—just a neat, direct window into ancient movement.

From ancient steps to present-day hoofbeats, or in this case, the absence of them. In the Midwest, wildlife officials are tracking hemorrhagic disease in deer. Michigan has confirmed cases, and in Missouri, the Department of Conservation is urging residents to report sightings.

The key details from Missouri’s agency: it’s a virus transmitted by gnats; it can cause rapid death in wildlife; and according to the agency, there’s no risk to humans. That last point is important context when people hear “hemorrhagic disease.”

Right—disease news can sound alarming. But here the emphasis is on monitoring deer populations and asking the public to call in observations, not on human health risk. And the gnat-borne bit explains why you may see cases cluster by season and geography.

We don’t have numbers here beyond “Michigan confirms cases.” So, we can’t quantify prevalence or mortality. What we do have is an official call for reporting in Missouri, which usually means they want eyes on the ground to spot changes early.

It underscores how conservation science relies on a pretty democratic network—hunters, hikers, landowners—because a ranger can’t be in every field. If you’re out there and you see a deer acting strangely or find one dead near water, that’s the kind of information they’re trying to gather.

And the framing matters. It’s a wildlife health event with management implications, not a direct human health emergency, based on the agency’s statement.

Speaking of insects with outsized impact, scientists from the University of Florida confirmed the presence of a mosquito species—Aedes amateuri—in Arizona’s mountain ranges. They noted a possible spread toward New Mexico but little immediate disease risk.

That’s a useful pairing of facts: confirmation of presence, and a measured assessment of risk. The species had been known from Mexico, and earlier reports had noted it in southeastern Arizona. Now we have a confirmation by researchers, which tightens the evidence.

I like the nuance here. “Possible spread toward New Mexico” keeps it tentative—tracking distribution is partly about climate, elevation, and the microhabitats these mosquitoes like. But “little immediate disease risk” is a reminder that not every newcomer is a public-health crisis.

Also, “possible” and “immediate” are doing a lot of honest work. Possible spread is not established spread; little immediate risk doesn’t speak to long-term scenarios. It’s a snapshot in time.

And a practical reason to keep sampling. New species on the move can tell us about changing environments and pathways—sometimes it’s cargo, sometimes it’s weather, sometimes just the ordinary expansion of a population finding a niche.

For listeners, the action item is modest: be aware of the finding, but there’s no alarm bell here per the researchers’ note on risk. Public health messaging is calibrated, and in this case, restrained.

Let’s switch from flying insects to fixed points on the Earth. The National Geodetic Survey says it will retire two big pillars of North American mapping—NAD 83, the horizontal reference frame, and NAVD 88, the vertical datum—and replace them with four new horizontal reference frames and a new vertical datum. Submissions to the old system will end on January 13, 2027.

If your eyes just glazed over, stick with us. A reference frame is the agreed-upon coordinate system that says where “here” is on a spheroidal Earth that moves a little. A vertical datum is how you define “zero” elevation. Updating these changes how precisely we place things in space.

Which sounds technical because it is, but the consequences ripple into daily life: surveying a property line, engineering a bridge, aligning a satellite image, even flood mapping.

The key is that systems evolve as measurements improve. Retiring NAD 83 and NAVD 88 in favor of new frames is a modernization step. The known date—January 13, 2027—for ending submissions to the old system is a hard scheduling fact. It gives agencies, companies, and researchers a runway to adapt.

So, imagine a quiet, behind-the-scenes infrastructure upgrade. Not as flashy as a rocket launch, but incredibly consequential for how we measure the world.

And like all transitions, it will require careful cross-walking to avoid confusion. The headline is simple: the yardsticks are getting updated, and there’s a timetable.

Speaking of rockets, let’s do our follow-up on Mars. We talked about sample return last week, and now there’s a new line in the sand. China’s space agency announced it aims to launch the Tianwen‑3 Mars sample‑return mission in 2028 and bring the material back by 2031.

That’s the update. We are returning to a story we already covered, and the new detail is the target launch and return years. There were earlier reports that the mission intends to collect about 500 grams of Martian material, but the fresh news this week is the timeline.

Meanwhile, NASA’s own Mars Sample Return program remains paused because of funding and technical challenges. That contrast is part of the week’s picture.

A couple of calibrations here. Announced aims—2028 and 2031—are plans, not guarantees. Planetary sample return is one of the most complex robotic tasks you can attempt: launch, transit, landing, collection, ascent from Mars, rendezvous, and return to Earth. Schedules can shift.

Still, a timeline focuses minds. If Tianwen‑3 makes those dates, by the early 2030s we could be looking at Mars rocks in labs, with all the careful planetary-protection protocols and science that follow.

And on the U.S. side, “paused” is a status, not a cancellation. Funding and technical challenges are solvable in principle, but they’re real constraints. It’s healthy to say both parts aloud: the aspiration is strong, and the path is nontrivial.

It’s also a reminder that space science is global and plural. Multiple agencies can—and increasingly do—take on ambitious missions. Our job here is to track what’s said and what’s done, week by week.

Staying in the space lane but looking inward: engineers at NASA’s Goddard Space Flight Center have raised concerns that recent relocations of laboratories and equipment delayed projects and heightened risk to upcoming missions. That’s a tough sentence for anyone with hardware on the clock.

The other side of the ledger is NASA officials saying these moves are cost‑saving measures intended to improve outcomes over time. That is, you consolidate or reconfigure now to be more efficient later.

The tension is familiar in any big organization: disruption versus anticipated gains. In spaceflight, though, the stakes are high and the timelines unforgiving. If you shift a lab and slip a schedule, you can miss a launch window or a test cadence.

Methodologically, all we can say from this week’s reporting is that engineers have flagged delays and increased risk, and officials have framed the changes as prudent restructuring with cost savings. We don’t have project-by-project data here, just the signal that mission readiness is a concern.

It’s a good moment to remember that “space mission” isn’t just the glossy probe on a fairing. It’s the ecosystem of benches, test stands, clean rooms, and the teams who know where every cable is.

And, given the earlier segment on sample return, you can see how institutional readiness is part of scientific capability. You need the science case, the budget, and the labs humming.

Let’s leave Earth entirely and look at Mercury—small, sun‑baked, and, according to a new study from researchers at the German Aerospace Center, apparently even smaller than we thought in one key sense. They say Mercury is losing about 14 miles of its radius, roughly 30 percent faster than earlier estimates.

To unpack that: we’re talking about total shrinkage since formation, not an ongoing weekly diet. Earlier analysis of data from the MESSENGER mission had suggested a smaller radius reduction—up to 11.6 kilometers. This study’s figure—about 14 miles—would be larger by comparison, hence the “roughly 30 percent” framing.

The physics reason, in broad strokes, is that as a planet cools, it can contract. But the exact number depends on the planet’s interior and how you interpret surface features as markers of contraction.

Right. This is a research result, not a tape‑measure reading. It depends on models and geological interpretation. The headline is “may have shrunk significantly,” and the quantitative claim is “about 14 miles of radius.” Both are appropriately cautious words in the source.

It’s a lovely example of how even for the closest planet to the Sun, our picture is evolving. And small differences—kilometers here or there—feed into big questions about interior structure and thermal history.

Also a reminder that “faster than earlier estimates” doesn’t mean “fast” in any colloquial sense. These are deep‑time processes. What changed here is the estimate, not Mercury’s behavior last Tuesday.

Before we close, I want to connect some dots. We started with a predator’s footprints preserved in rock, moved through a gnat‑borne deer disease and a newly confirmed mosquito in high country, then into the quiet revolutions of mapping and loud ambitions of Mars. We even squeezed Mercury a little.

Gently.

The thread, at least to my ear, is measurement. Footprints measure a stride. Field calls measure a wildlife outbreak. Confirming a mosquito’s range is measuring habitat. Updating geodetic frames is measuring the planet we stand on. Mars sample return is the promise to measure another world’s rocks directly. And Mercury’s contraction is a measurement of change written across a whole planet.

And the other thread is humility. One trackway is data, but not destiny. One agency’s “no risk to humans” is clear, but limited to the present moment. One study moves a number, and we wait for others to test it.

That’s why I like weeks like this. They’re not about fireworks; they’re about patient, careful work—the kind that accumulates into real understanding.

That’s our show. If you want clean, checked context on the stories you care about, head to factslane.com or grab the app in the App Store or Google Play. You choose the topics, people, companies, and places, and FactsLane keeps track and catches you up with facts that have been vetted.

And if you like a weekly dose beyond science, check out our sister shows—Good Week for a clear-eyed look at what went right, and Tech Week for the best in technology without the buzzwords.

Thanks for listening, stay curious, and we’ll see you next week.

Take care, everyone.