Michael Greshko
National Geographic
Washington, DC, United States
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Past articles by Michael:
Could dinosaurs swim? A new fossil revives an age-old debate.
There aren’t many dinosaurs confirmed to be semiaquatic. A new discovery adds a duck-like species to their narrow ranks. → Read More
Frank Drake, pioneer in the search for alien life, dies at 92
During a lifetime studying the sky, Drake's scientific contributions—and his namesake equation—became foundational to scientists' search for life beyond Earth. → Read More
Should T. rex be 3 species? New study sparks fierce debate.
If a controversial new study is right, famous fossils such as Sue and Stan aren’t T. rex after all. But leading experts are highly skeptical. → Read More
Dinosaur-killing asteroid most likely struck in spring
Fossil fish in North Dakota add to evidence that the impact 66 million years ago might have been a worst-case scenario. → Read More
See the spectacular fossils from a newly discovered prehistoric rainforest
Hundreds of amazingly well-preserved finds from Australia include plants, insects, fish, and more that existed more than 11 million years ago. → Read More
What is the winter solstice? Here’s what you need to know.
Once a year, an astronomical alignment ushers in this seasonal change. The winter solstice is celebrated across the world—and shrouded in myth. → Read More
Signs of an extreme planet found in another galaxy
An odd x-ray signal hints that a Saturn-size world could be the first known planet lurking in the Whirlpool Galaxy 28 million light-years away. → Read More
Fossil bonanza reveals earliest evidence of dinosaurs living in herds
A wealth of new Mussaurus eggs and skeletons suggests these Jurassic herbivores were among the first dinosaurs to travel in groups broken up by age. → Read More
One of the largest comets ever seen is headed our way
Comet Bernardinelli-Bernstein offers a rare opportunity for a generation of astronomers to study an object from the extreme edges of the solar system. → Read More
The ‘small wonders’ unlocking secrets of the solar system
Modern astronomy is giving us unprecedented views of the asteroids, comets, and other small bodies that litter our cosmic home. These planetary leftovers offer clues to our creation—and potential destruction. → Read More
Fossils of rhino taller than a giraffe found in China
One of the largest land animals ever, the newfound species roamed between what is now the Tibetan Plateau and Pakistan more than 25 million years ago. → Read More
Mystery event caused shark populations to crash 19 million years ago
Fossil records show that roughly 90 percent of the planet's open-ocean sharks inexplicably vanished. → Read More
NASA selects SpaceX to build the lunar lander for Artemis missions to the moon
The space agency announced today that it has awarded SpaceX a $2.9 billion contract to develop a version of the Starship rocket that can land people on the moon. → Read More
Million-year-old mammoth teeth yield world's oldest DNA
The record-breaking genetic material is offering fresh insights into how North America’s mammoths lived and evolved. → Read More
What the data show about allergic reactions to COVID-19 vaccines
A new report from the CDC reveals how rare severe reactions actually are and what people can do if they are worried about taking the shot. → Read More
What is the summer solstice? Here’s what you need to know.
Once a year, an astronomical alignment ushers in this seasonal change that’s celebrated across the world—and shrouded in myth. → Read More
1,000-year-old bones represent oldest tsunami victims in East Africa
A great wave submerged an ancient fishing village in present-day Tanzania, prompting researchers to revisit the risk of tsunamis on Africa’s east coast. → Read More
Bizarre Spinosaurus makes history as first known swimming dinosaur
A newfound fossil tail from this giant predator stretches our understanding of how—and where—dinosaurs lived. → Read More
Puzzling skeleton helps reveal how ancient human relative grew up
The fossilized bones represent the first partial skeleton assembled for a juvenile Homo naledi. → Read More
As coronavirus surges, here’s what is known and unknown about treatment
Six leading physicians explain what we know so far about treating COVID-19 in the emergency room and at home. → Read More