New species evolved within a few thousand years of the Chicxulub Impact
TL;DR
Imagine the worst day in Earth's history: 66 million years ago, a giant asteroid slammed into what is now Mexico's Yucatan Peninsula, wiping out the dinosaurs and about 75% of all species on Earth. The oceans were especially hard hit. Tiny shelled creatures called foraminifera — think microscopic snails that float in the ocean — were nearly completely wiped out. Scientists used to think it took around 30,000 years before new species of these creatures started showing up. But this new study used a clever trick: measuring a rare type of helium (helium-3) that rains down from space at a steady rate, like a cosmic clock, to figure out exactly how fast sediment was piling up on the ocean floor. By doing that, they could measure time far more precisely. What they found was shocking — brand new species were appearing in the fossil record less than 2,000 years after the asteroid hit. That's incredibly fast for evolution. In fact, up to 10 brand new species appeared within a window of just 3,500 to 11,000 years across six different ocean locations around the world.
Abstract The immediate aftermath of the Cretaceous/Paleogene (K/Pg) mass extinction (ca. 66 Ma) in the marine realm was characterized by the initial recovery of productivity and the originations of new species. These major events are recorded in sediments a few centimeters above the K/Pg boundary and are typically dated via planktic foraminiferal biostratigraphy. The first Paleocene planktic foraminifer biozone is Zone P0, defined as the interval between the extinction of Cretaceous species and the first appearance of the new Paleocene taxon Parvularugoglobigerina eugubina. Constraining the age of the top of the global Biochron P0 is crucial for understanding how quickly this initial diversification occurred. However, the long-accepted value, ~30 k.y. after the boundary, is based on the assumption of constant sedimentation rates across the K/Pg boundary. We provide a new calibration for this important biostratigraphic marker using published records of 3He, a proxy for instantaneous sedimentation rates, from six K/Pg boundary sites. We find Biochron P0 durations between 3.5 k.y. and 11.1 k.y., with an average of 6.4 k.y. Taxonomic concepts vary among researchers, but as many as 10 new species of planktic foraminifera have been observed within Zone P0, with many more reported at or just above its top. Based on our new calibration, the first of these new species appeared <2 k.y. after the Chicxulub impact. The ages and order of these first appearances vary slightly from site to site, suggesting biogeographic differences between sites as novel taxa evolved and dispersed.
- 1Biochron P0 durations at six K/Pg boundary sites range from 3.5 k.y. to 11.1 k.y., with an average of 6.4 k.y., far shorter than the previously accepted ~30 k.y. estimate.
- 2The first new species of planktic foraminifera appeared less than 2,000 years after the Chicxulub impact, demonstrating extraordinarily rapid post-extinction speciation.
- 3Up to 10 new species of planktic foraminifera evolved within Zone P0, with many more appearing at or just above its top.
- 4New calibration of Biochron P0 used helium-3 (3He) as a proxy for instantaneous sedimentation rates across six K/Pg boundary sites, replacing the assumption of constant sedimentation rates.
- 5Slight variation in the ages and order of first appearances among sites suggests biogeographic differences in the evolution and dispersal of novel taxa after the mass extinction.
Over 20,000 precolonial earthworks in the Southwest Amazonia
Imagine flying a special laser scanner over the Amazon jungle that can 'see through' the treetops, like X-ray vision for the ground. When scientists did this, they found over 20,000 geometric shapes — ditches, mounds, and enclosures — built by ancient people long before Europeans arrived. These aren't small things: they're massive earthen structures, like monuments. This means the Amazon rainforest, which most people picture as empty wilderness, was actually home to millions of people who built cities and shaped the landscape. Think of it like discovering that a forest you thought was wild was actually someone's ancient garden on a continental scale.
A digitally controlled silicon quantum processing unit
Imagine you want to build a super-powerful calculator that uses the weird rules of quantum physics to solve problems no regular computer can. The trouble is, the tiny quantum pieces — called qubits — are incredibly fragile and need to be kept colder than outer space. On top of that, you need wires and control signals going to every single qubit, and if you have thousands of them, the wiring becomes a nightmare. This team solved part of that puzzle by building their qubits out of silicon (the same stuff in your phone's chip), adding a tiny control computer that works at super-cold temperatures right next to the qubits, and using a special high-density cable to connect everything cleanly. They packed 54 tiny quantum dots onto a chip, arranged 18 of them into working qubits, and showed the qubits work about 10 times better than any previous silicon qubit of this type. They also ran basic error-correction experiments to prove the system is on track for real-world use.
The 2026 World Cup's grass is an engineering problem
Imagine you're trying to play soccer in 16 different places across the United States, Canada, and Mexico — some in freezing cold, some blazing hot, some in stadiums with roofs that block sunlight. Half of those stadiums normally use fake grass. Now FIFA, the organization that runs the World Cup, wants every single pitch to feel and play exactly the same way, like a video game where every level has identical physics. To do that, they hired grass scientists — yes, that's a real job — who figured out how to grow special grass on thin mats with plastic underneath so it can be transported like a carpet, stitched with synthetic fibers so it doesn't rip when players sprint and tackle, and tested by literally shooting balls at it with a cannon to make sure it bounces right. Different grass species are used depending on whether a stadium is hot, cool, or dark. It's basically a giant, living, high-tech floor installation that has to survive the world's best athletes running on it.
Remarks on the disproof of the unit distance conjecture
Imagine you scatter a bunch of dots on a piece of paper. The question is: how many pairs of those dots can be exactly 1 inch apart? The Erdős unit distance conjecture asked whether there's a specific mathematical formula that limits how often this can happen as you add more and more dots. Think of it like asking how many friendships can exist in a town where friends are defined as people who live exactly one mile apart — there's a suspected maximum, and Erdős guessed what that maximum should be. For decades, no one could prove or disprove his guess. Now, an AI apparently found a specific arrangement of dots (a 'counterexample') that breaks the expected limit, proving Erdős's conjecture was wrong. A team of elite mathematicians then checked and explained the AI's work in this paper.