Science

Diffusion is the net movement of particles from an area where they are more concentrated to an area where they are less concentrated. It happens because particles are in constant random motion: their individual paths are unpredictable, but across a large group the overall movement tends to spread them more evenly. What diffusion means Particles […]

There is no single average lifespan for all birds: a bird’s life expectancy varies greatly by species, body size, environment, and whether it lives in the wild or under human care. Many small wild birds live only a few years on average, while some large birds and seabirds can live for decades; a few individuals

Hummingbirds are the only birds able to fly backward in a sustained, controlled way. Their unusual wing motion lets them hover, retreat from a flower, and change direction with remarkable precision. Why hummingbirds can fly backwards The short answer is hummingbirds: members of the bird family Trochilidae. Their flight is distinctive because the wings do

The western barn owl is a pale, long-legged owl found across much of western North America, where it hunts mainly at night and often nests in cavities or buildings. It is a population of the barn owl, known for its heart-shaped face, exceptionally quiet flight, and sharp hearing that helps it locate prey in darkness.

Water deer are small, tusk-bearing deer native to East Asia, best known for the long upper canine teeth of adult males and their close association with wetlands. The name refers to two living species, the Chinese water deer and the Korean water deer, whose ranges and habitats differ despite their similar appearance. What Is a

An aircraft is made up of structures and systems that create lift, control movement, provide thrust, and carry people or cargo safely. On a typical fixed-wing airplane, the main parts are the fuselage, wings, tail assembly, engines, landing gear, and the control surfaces and systems that connect them. The exact layout varies: a glider has

To calculate momentum after a collision, multiply each object’s mass by its velocity after impact, using a consistent direction convention. If you need the total momentum of the colliding objects, add their signed momenta; in an isolated system, that total equals the total momentum before the collision. This guide explains how to choose the right

A queen ant is usually not chosen by a vote or appointed by worker ants: in most species, queens develop from larvae that receive the right combination of nutrition, hormones, and genetic cues. The details vary widely, and some colonies begin with a single newly mated queen while others produce many reproductive females and let

Barn owls are pale, long-legged hunters famous for their heart-shaped faces and remarkably quiet flight. They can locate small prey by sound in darkness, swallow much of it whole, and later cough up compact pellets containing indigestible bones and fur. What Makes a Barn Owl a Barn Owl? The barn owl is a widespread owl

Yes, many bird species have gone extinct in the United States, including the passenger pigeon, Carolina parakeet, and great auk. Some disappeared from the entire world; others were lost from the United States while surviving elsewhere, so “extinct in the US” can mean more than one thing. What “extinct in the US” means In ordinary