Charles Darwin puzzled over why ants come in such wildly different sizes. The question even made him doubt his theory of evolution. New research might explain why.
Normal Pheidole minor worker (left) and soldier (right). The individual in the centre is an intermediate produced after the soldier inhibitory pheromone halted growth of its rudimentary wing discs while it was developing. Image via Abouheif Lab.
What’s happening in your dog’s brain when it hears you say squirrel? New research looks at how dog’s brains react to human words.
Eddie, one of the dogs that participated in the study, poses in the fMRI scanner with two of the toys used in the experiments, "Monkey" and "Piggy." Image via Gregory Berns.
The coming full moon – Hunter’s Moon for the Northern Hemisphere – is October 24. Will it be bigger, brighter, more colorful? All you need to know here.
The November full moon is also called the Beaver Moon. You can see all the full moon names here. Maggie NY wrote, "November's Beaver Moon over NY."
A waxing gibbous moon appears more than half lighted, but less than full. It rises before sundown and sets somewhere between midnight and dawn. The coming full moon – Hunter’s Moon for the Northern Hemisphere – is October 24.
Not a full moon, but pretty close, from Odilon Simões Corrêa in Brazil.
Binary asteroids – that is, asteroids with moons – aren’t uncommon. More than 300 have been discovered so far. Astronomers found a moon for 2018 EB when it swept closest to Earth on October 7.
Asteroid 2018 EB and its moon.
The fossils of Ledumahadi mafube suggest that it was the largest land animal alive 200 million years ago.
Artist's conception of Ledumahadi mafube. Image via
Venus will sweep near the sun in our sky (inferior conjunction) on October 26. Astronomer Guy Ottewell uses his great skill at illustration to compare this passage of Venus with the last one, and the next one.
. | Illustration of Venus in the daytime sky - shown over a span of some days around the time Venus will sweep near the sun in our sky at inferior conjunction
on October 26, 2018. This is a tough one to see from the Northern Hemisphere! The slender sun-illuminated crescent of Venus is exaggerated 150 times in size; the dot at the center of the crescent is the planet’s actual position (and nearer to its real size). The sun is exaggerated only twice in size. You won’t see the details other than the sun and – hopefully – Venus, but they tell you the way you’re looking into the solar system and the universe. Illustration via Guy Ottewell's blog
Experts had said “no outburst” predicted for the 2018 Draconids. But, since the parent comet had recently passed near, observers knew to watch anyway.
A 1st quarter moon is high up at sunset. You see it half-illuminated, like half a pie. Really, you’re seeing half the moon’s day side.
September 16, 2018 1st quarter moon - in a hazy blue sky, before sunset - over Toronto, via Steven A. Sweet of Lunar 101 Moon Book.