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13 Coolest Scientific Discoveries of the Year

From new planets to DNA breakthroughs to whale earwax, 2018 has been filled with fascinating scientific stories.

From an aerial view, a blue whale swims under the surface in Monterey Bay, California. Chase Dekker/Shutterstock

Whale earwax shows stress levels

Over their long lives, whales accumulate earwax plugs that can get as long as ten inches in large species. The plugs show bands that correspond with their age—every year, they have heavy feeding times and migration times that change the color of the wax. In a report published in the journal Nature Communications in November, researchers described how they studied the chemical make-up of the bands and discovered that the whales produced significantly more of the stress hormone cortisol during years when the most whales were being hunted (the early 20th century and the 1960s), as well as during World War II, when whaling was low but submarines, battleships, and depth charges were common.

Cortisol levels have been steadily rising in recent decades too, despite the fact that whaling has been uncommon since the 1970s hunting moratoriums were put in place. Warming sea temperatures appear to be creating stress for the marine mammals, scientists told the Atlantic. Don’t miss these science “facts” that aren’t actually true.

Lake on MarsRoma/IPA/Shutterstock

It looks like there’s a lake on Mars

This past summer, a report in Science revealed that radar scans from the Mars Express spacecraft had detected an underground lake on the red planet, below the southern ice cap. (The Mars Express is a project of the European Space Agency.) Although ice and gaseous water have been found on Mars, its surface clearly shows that at some point in the past the planet had plenty of liquid water that had somehow gone missing, according to National Geographic. If the Martian seas somehow ended up as underground reservoirs, they could provide resources for future human missions to the planet. Even more intriguingly, astrobiologists say the lake could be conducive to life: Elena Pettinelli of Italy’s Roma Tre University—one of the paper’s authors—points out that the similar environment of the Antarctic hosts living bacteria.

Mars - the red planet. Martian surface and dust in the atmosphere. 3D illustrationJurik Peter/Shutterstock

NASA landed the InSight on Mars

The InSight lander made a flawless descent to the red planet’s surface in November. Its mission is to study Mars’s seismic activity, which will allow scientists to gain a better understanding of the thickness of its crust and the size and temperature of its molten core, according to the New York Times. The InSight joins two NASA Mars rovers on the planet: Curiosity, which is searching for signs of microbial life, and Opportunity, which went silent this past summer during a dust storm that probably disabled its solar panels (the agency is hoping that wind will blow the dust off and allow Opportunity to restart).

Geocolor Image in the eye of Hurricane Irma. Elements of this image furnished by NASA.Trong Nguyen/Shutterstock

Climate change’s worst-case scenario can still be avoided

The Intergovernmental Panel on Climate Change’s massive report, released in the fall, laid out the bad news: We have only a dozen years to take serious action if we want to keep global warming to 1.5 degrees Celsius. But the report contained a nugget of hope: Limiting warming to 1.5 C—as opposed to allowing it to reach the 2 degree-limit set by the Paris climate agreement—would be dramatically less disruptive, according to the World Resources Institute; it would help reduce the risk of catastrophic heat events, rising ocean levels, and species loss.

To limit the damage, governments around the globe will need to work together to cut carbon emissions by increasing the world’s energy efficiency, replacing fossil fuels with renewable energy, and protecting—and planting—atmosphere-cleansing forests. A U.S. climate report released the day after Thanksgiving predicts that climate change could shrink the country’s economy by 10 percent before 2100, providing legislators with motivation to get moving. Don’t miss these science mysteries no one has figured out.

Plastic bags and other trash littered into the ocean from people float near the surface of the sea.Shane Gross/Shutterstock

A nonprofit is trying to clean up the Pacific garbage patch

A Dutch organization called The Ocean Cleanup launched a large trap to collect trash from the swirling mess of plastic in the middle of the Pacific Ocean where currents meet. Although the system is still in it’s testing phase, the goal is to float the U-shaped boom through the garbage, and then collect the large plastic pieces for disposal on land before they’re broken down by the sunlight and waves into microplastics—harmful to sea life, according to National Geographic.

Amur tiger walking in the water. Dangerous animal, taiga, Russia. Animal in green forest stream. Grey stone, river droplet. Wild cat in nature habitat.Ondrej Prosicky/Shutterstock

Animal populations are shrinking dramatically

According to the WWF Living Planet Report for 2018, the average number of vertebrate populations—mammals, birds, fish, reptiles, and amphibians—decreased by 60 percent between 1970 and 2014. Habitat degradation and loss, overfishing, and overhunting top the list of causes. In South and Central America, animal populations have fallen by a staggering 89 percent, on average. Take a look at these 10 animals that have gone extinct in the past 100 years.

Cute baby gorilla in the Rwanda forestJurgens Potgieter/Shutterstock

Mountain gorillas are bouncing back

Some species are bucking the trend, though. Mountain gorillas, a subspecies of the Eastern gorilla, have been shifted from critically endangered status to endangered, reports the International Union for Conservation of Nature and Natural Resources (IUCN)—that’s a step in the right direction. There are now more than 1,000 mountain gorillas living in the Democratic Republic of the Congo, Rwanda, and Uganda; that’s up from about 680 in the IUCN’s last tally a decade ago. The primary factor driving their recovery is ecotourism, which funds high numbers of field staffers and on-site veterinary care for the animals, according to the New York Times, as well as leading local and national governments to step up efforts to protect the magnificent animals from poachers and other threats.

This is a macro of an ant inside a yellow flower of Turnera ulmifolia. Jeremy A. Casado/Shutterstock

Bugs are disappearing

Despite how you might feel about individual insects, losing them as a whole would be catastrophic for the planet. A 2018 study published in the Proceedings of the National Academy of Sciences found that the biomass of arthropods (including insects, spiders, and centipedes) in the Luquillo rainforest in Puerto Rico has decreased as much as 60-fold since the 1970s. Populations of birds, frogs, and lizards that eat arthropods in the forest have also fallen. The data matches studies published in recent years that show dramatic declines in the numbers of insects around the world, according to the Washington Post.

Close-up of Milky way galaxy with stars and space dust in the universe, Long exposure photograph, with grain.sripfoto/Shutterstock

There’s new evidence for a ninth planet

Ever since Pluto got downgraded to dwarf planet status in 2006, our solar system hasn’t felt complete. But astronomers have had their eye on some unusual goings-on way out beyond Pluto. This year, they identified an object called 2015 TG387 moving in an unusual elliptical 40,000-year orbit around the sun. Because it’s so far away from Jupiter, Saturn, Uranus, or Neptune, it’s most likely indicating the presence of a larger, unseen mass, according to the Atlantic. Not all astronomers agree that Planet Nine (or Planet X) is the only explanation, but they’re continuing to search. Find out the astronomy facts you never learned in school.

Neanderthal vs human skull Petr Student/Shutterstock

Neanderthals and Denisovans interbred

DNA testing of a 90,000-year-old bone fragment pulled out of a Siberian cave showed that it belonged to a teenage girl whose mother was a Neanderthal and whose father was a Denisovan, a genetically distinct group of ancient human relatives that went extinct about 40,000 years ago. Although researchers had suspected that the species interbred, the discovery of first-generation evidence surprised them, according to National Geographic. About two percent of DNA from most Europeans and Asians has been passed down from Neanderthals, and Denisovan DNA is found in people from Melanesia, the Pacific islands that include New Guinea. Read about 13 of the weirdest things archaeologists have discovered.

Concept of biochemistry with DNA molecule DNA sequencing Protein, cancer gene research, CRISPR Research and gene editing 3D renderCI Photos/Shutterstock

The first genetically-designed babies might have been born

In November, a Chinese scientist named He Jiankui announced that he had used the gene-editing technology called CRISPR to alter the DNA of two embryos, and then implanted them in the mother; the two baby girls were born healthy, he claims. The team disabled a gene that was meant to make the babies immune to HIV. Although at press time the scientist had yet to offer independent evidence that his claims were true, researchers around the world were stunned and disturbed by the announcement: The scientific consensus has been that CRISPR technology isn’t precise enough to be used in human embryos, yet. What’s more, in a consensus statement by an international group of scientists, the community agreed that the process will require strict oversight and only be tried for serious genetic diseases that lack treatment options. Here’s what doctors have to say about genetic testing.

Blue light flasher atop of a police car. City lights on the background. ArtOlympic/Shutterstock

Science catches the Golden State Killer

Joseph James DeAngelo, 72, who is suspected of murdering a dozen people and raping at least 45 during the 1970s and 1980s, was arrested in April after investigators matched unusually well-preserved crime-scene DNA to him by entering it into an online database meant for genealogy research, according to the New York Times. DeAngelo had not uploaded his own DNA information to the database, but at least ten distant relatives of his had—and police used the information to narrow down their suspect list, reports Verge. In the fall, a study published in Science suggested that most white Americans could be identified using similar technologies even if they haven’t submitted their own DNA samples to public databases, raising privacy concerns. Here are 15 of the most famous psychopathic killers in history.

Supra glacial Lakes over the Ice Sheet in Greenland. Aerial Shot.Milan Petrovic/Shutterstock

There’s a massive impact crater under the Greenland ice sheet

Researchers found one of the 25 biggest impact craters on the Earth’s surface underneath a glacier in Greenland, according to Smithsonian. They were using radar to track changes in the ice sheet and found evidence of a 19-mile-wide, 1,000-foot-deep crater that’s unusually well-preserved. Scientists theorize that it might have been caused by a meteorite strike as recent as 12,000 years ago (or, at most, 3 million years ago). This direct hit might help explain a thousand-year-long unexpected temperature drop that occurred about 12,800 years ago—just as the Earth was warming up following the last ice age. Now read about the scientific mysteries we take for granted.