David W. Brown writes: On a brisk day in February, 2004, Dante Lauretta, an assistant professor of planetary science at the University of Arizona, got a call from Michael Drake, the head of the school’s Lunar and Planetary Laboratory. “I have Lockheed Martin in my office,” Drake said. “They want to fly a spacecraft to an asteroid and bring back a sample. Are you in?” The two men met that evening with Steve Price, then a director of business development…
Viviane Callier writes: Just as people in different places seem to operate at different rhythms, so too do different species. They age at their own rates: Some, like the fruit fly, race to adulthood so they can reproduce before their ephemeral food source disappears, while creatures like humans mature slowly over decades, in part because building a large, complex brain requires it. And at the very beginning of an embryo’s life, small tweaks in the timing of when and how…
Live Science reports: A sea animal so simple that it looks like a blobby pancake may hold the secret to the origin of neurons. Placozoans are one of the five major branches of animals, along with bilaterians (which include everything from worms to humans), cnidarians (corals and medusas), sponges and ctenophores (comb jellies). They’re the most basic of the bunch, consisting of millimeter-long blobs of cells without organs or body parts. They move through the water using cilia — tiny…
Veronique Greenwood writes: For ecologists, tropical rainforests hold many enigmas. A single hectare can contain hundreds of tree species, far more than in forests closer to the poles. Somehow these species coexist in such dizzying abundance that, as naturalists and ecologists have sometimes noted, tropical forests can feel like botanical gardens, where every plant is something new. For such throngs of species to be packed so densely, they must coexist in a very particular balance. Evolution seems not to favor…
Yasemin Saplakoglu writes: Scientists have debated why life became homochiral [that is, having molecular asymmetry], and whether it needed to happen or if it was purely a fluke. Were chiral preferences impressed on early life by biased samples of molecules arriving from space, or did they somehow evolve out of mixtures that started out as equal parts right- and left-handed? “Scientists have been mystified by this observation,” said Soumitra Athavale, an assistant professor of organic chemistry at the University of…
Olivia Judson writes: I want to start with a proposition: if Earth had never come alive, it would be a profoundly different world. Conversely: the planet of today has, to a remarkable extent, been made what it is by the activities of lifeforms. Over the course of the planet’s long history, a history that extends back more than 4.5 billion years, lifeforms have shaped the rocks, the water, the air, even the colour of the sky. A Never-Life Earth would not even…
Carolyn Wilke writes: Young jumping spiders dangle by a thread through the night, in a box, in a lab. Every so often, their legs curl and their spinnerets twitch — and the retinas of their eyes, visible through their translucent exoskeletons, shift back and forth. “What these spiders are doing seems to be resembling — very closely — REM sleep,” says Daniela Rößler, a behavioral ecologist at the University of Konstanz in Germany. During REM (which stands for rapid eye…
Brian Butterworth writes: You might think of counting as something that people do involving the words one, two, three and so on. But we don’t require the use of these words to enumerate a collection of objects. Indeed, some languages do not have long lists of counting words. In studies of children who speak languages with a smaller set of such words (eg, words for one, two, few and many), such as the Indigenous Australian language Warlpiri, my colleagues and I found that they were at least as accurate…
Lina Zeldovich writes: Floating in the middle of our galaxy, near the center of the Milky Way, inside a cloud of gas that swirls at the temperature of 100 Kelvin or -279.67 Fahrenheit, a molecule essential to life on Earth has just been discovered. It sounds inconceivable that such a level of cosmic cold could harbor anything remotely related to a living organism—and yet it does. In fact, without this molecule, humans—and all other breathing, growing things on the planet—would…
James Bridle writes: It turns out there are many ways of “doing” intelligence, and this is evident even in the apes and monkeys who perch close to us on the evolutionary tree. This awareness takes on a whole new character when we think about those non-human intelligences which are very different to us. Because there are other highly evolved, intelligent, and boisterous creatures on this planet that are so distant and so different from us that researchers consider them to…
Saugat Bolakhe writes: Biologists have understood the broad contours of the rules of inheritance for more than a century: that genes are passed down from parent to child within species. But in more recent years, they have also become aware of genes that go rogue and hop laterally between species — be they frog genes in Madagascar that originally came from snakes, or antifreeze genes found in cold-water fish like herring that transferred to smelts. The mechanism facilitating this gene…
GrrlScientist writes: Tragically, the global mass extinction event that we find ourselves in the midst of will be even worse than originally predicted, according to a recent study (ref). The international team of scientists came to their conclusion after analyzing population trends data for more than 71,000 animal species — including mammals, birds, reptiles, amphibians, fish and insects — from around the world to see how their numbers have changed since record-keeping first began. Generally, scientists agree that an extinction…
Science reports: Babies don’t babble to sound cute—they’re taking their first steps on the path to learning language. Now, a study shows parrot chicks do the same. Although the behavior has been seen in songbirds and two mammalian species, finding it in these birds is important, experts say, as they may provide the best nonhuman model for studying how we begin to learn language. The find is “exciting,” says Irene Pepperberg, a comparative psychologist at Hunter College not involved with…
Zack Savitsky writes: In 2017, a team of scientists from Germany trekked to Chile to investigate how living organisms sculpt the face of the Earth. A local ranger guided them through Pan de Azúcar, a roughly 150-square-mile national park on the southern coast of the Atacama Desert, which is often described as the driest place on Earth. They found themselves in a flat, gravelly wasteland interrupted by occasional hills, where hairy cacti reached their arms toward a sky that never…
The New York Times reports: Most people try, or at least hope, to avoid ticks. The tiny arachnids spread a variety of harmful diseases as they expand their range to new areas. But two scientists recently set out on a counterintuitive mission to collect as many bloodsucking ticks as possible. “We had quite a few nice afternoons of frolicking around forests with bedsheets,” Sam England, a biologist at the Natural History Museum in Berlin, said. “Just dragging them, picking up…
Science Alert reports: Biologists usually define ‘life’ as an entity that reproduces, responds to its environment, metabolizes chemicals, consumes energy, and grows. Under this model, ‘life’ is a binary state; something is either alive or not. This definition works reasonably well on planet Earth, with viruses being one notable exception. But if life is elsewhere in the universe, it may not be made of the same stuff as us. It might not look, move, or communicate like we do. How,…