Estimates of how fast the universe is expanding disagree. Could a new form of dark energy resolve the problem?

Flex your math muscles with this weekend’s brain teaser. Play now.

Their dream came spectacularly true on that momentous day in 1974. The Lucy fossil preserved skull fragments and a lower jaw ...

No words are needed for animals to perform all sorts of problem-solving challenges outplay humans in a strategy game New ...

Phone apps can tell whether your kid is playing hooky. But remotely surveilling your child might not be great for navigating ...

Gentle nasal spray vaccines against COVID, the flu and RSV are coming. They may work better than shots in the arm ...

Anyone who is capable of seeing the moon (or the sun) near the horizon has experienced this effect. The moon looks enormous ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www.springernature.com/us). Scientific ...

Pediatric long COVID is more common than many thought, and we keep letting kids be reinfected with new variants ...

Harris would continue the Biden administration’s landmark climate efforts; Trump would roll the country back to more oil and ...

For the first time, we are sending a spacecraft to explore an alien ocean world—a moon that might host life today ...

We talk to Cristina Gonzalez, a doctor at New York University, who runs a lab that uses simulations to help medical ...