Science & Nature Videos

I am a school teacher, and here I will tell you my real story about the 15mW green laser pointer. In my class, I usually use PowerPoint. In modern teaching field, this is a quite useful and...

The length of a volcanic eruption can vary dramatically, and some eruptions have been known to last continuously for decades. Learn about the lack of ability in predicting the length of volcanoes...

The process of a volcano erupting begins with the generation of magma, which then migrates towards the surface until the pressure and temperature can equalize. Find out why sometimes there is...

Signs that a volcano may erupt include small seismic shocks, ground swelling and releases of gas, steam or ash. Discover why most signs of volcanoes can't be detected without instruments with help...

An eruption of an underwater volcano, which causes pillow basalts, is the same as an eruption on land, except that the eruption cools more quickly. Learn about underwater gas eruptions from...

Volcanoes can erupt only once, but other volcanoes, such as Kilauea, can erupt continuously for almost 30 years. Discover how those who study volcanoes define active volcanoes with help from the...

Hail forms with an uplift that involves air rising, cooling and condensing as the temperature goes down. Discover how hail can get larger through winds that pick it up and coat it with more ice...

The gravitational pull of the moon and the rotation of the earth, coupled with the centripetal force of the earth, causes two high tides and two low tides throughout the day. Find out why the...

Pollution in the air can be caused by substances that are both man-made and natural compounds. Find out how air pollution can be caused by volcanic eruptions with help from the chair of a...

Wind-driven currents are caused by the return of large circulation cells, of which there are three between the equator and the poles. Find out how circulation cells also move heat over the planet...

Thunderstorms are essentially caused by differences in temperature and pressure, and the larger these differences are, the more severe the thunderstorm will be. Learn about electrical disturbances...

Latitude can affect climate through circulation, and the wind bands known as trade winds differ depending on latitude. Discover how the movement of weather systems is controlled by large wind...

Molecules are made up of two or more atoms, such as hydrogen and oxygen to make water, or sodium and chloride to make salt. Discover how molecules are formed with important facts from a science...

What components or particles make up an atom? Continue learning science in this free educational video atoms and matter.

The electrons of an atom represent the energy levels, and there are usually as many protons as there are electrons. Understand how each level carries a prescribed number of electrons with...

The atomic number, as denoted on the periodic table, refers to the number of protons in a single atom of that particular element. Learn more about the organization of the periodic table with...

The model of an atom illustrates the nucleus, the protons, the neutrons and the electrons as they would appear through and electron microscope. See what an atom looks like in three dimensions with...

The water cycle illustrates evaporation and condensation as it occurs around the world to recycle the planet's water. Learn about the the earth's water usage with important facts from a science...

The transfer of matter refers to the changing states of matter, such as evaporation and condensation. Find out how matter can completely change and move with important facts from a science teacher...

The periodic table is a way to organize the elements that create the chemicals that form every physical thing in the world. Understand how the periodic table is organized with important facts from...

Atomic symbols consist of a letter abbreviation for the element and coordinating numbers. Identify elemental symbols with important facts from a science teacher in this free video on fundamental...

Atomic mass refers to the mass of the atom, which does not change regardless of the force of gravity. Understand the difference between mass and weight with important facts from a science teacher...

Different forms of matter are known as physical states, and scientists have been able to identify five stages of matter. Learn about the physical states of matter with important facts from a...

The five states of matter include liquid, solid, gas, plasma and Bose-Einstein condensate. Find out how matter can change from one state to another with important facts from a science teacher in...

The first three states of matter, solid, liquid and gas, can be illustrated by an ice cube, a solid, that melts into water, a liquid, and evaporates into the air, a gas. Understand the movement of...

Science is important to study to better understand the makeup of the world and the role the humans take in the universe. Discover the amazing world of atoms, molecules and matter with important...

Atoms are the smallest identifiable piece of matter that make up the building blocks of every physical thing. Understand the definition of an atom with important facts from a science teacher in...

Simple things you can do to get pictures or video of wildlife feeding in your yard.

Bat feces, known as guano, looks similarly to mouse droppings, which take the form of small brown pellets. Find out how to identify animal droppings with helpful information from an associate...

Bats make a variety of sounds that can be broken into the two categories of echo location sounds and communication sounds. Learn about the sounds bats make, some of which are inaudible to human...

During the daylight hours, most bats sleep, rest, groom each other or roost in trees, while other species of bats remain active throughout the day. Find out what bats do during the day with...

Most brown bats weigh less than 1 ounce, but they can range from only 7 grams to 18 or 20 grams. Understand the size ranges of brown bats with helpful information from an associate professor of...

Keeping bats as pets is never recommended because they are wild animals, but bats in captivity are best suited for zoos and conservation centers. Avoid taking care of a bat without professional...

In the winter time, some bats hibernate while their food source is low, but other species of bats migrate south. Find out how bats survive the winter with helpful information from an associate...

Bats hang upside down because their feet have evolved to be in the clamped position when all muscles are relaxed, so hanging from their feet uses no bodily energy at all. Find out why bats hang...

There are more than 1,000 diverse species of bats that reside on every continent but Antarctica. Discover the vast variety of bats that exist in the world with helpful information from an...

The average life span of a bat is 5 to 6 years old, depending on the species, but there was one bat that was found to be more than 30 years old. Explore the possible life expectancy of a bat with...

Vampire bats live only in Central and South America, where three different kinds of vampire bats can be found. Learn about the habitat and behavior of vampire bats with helpful information from an...

Bats usually sleep during the daytime, as they are nocturnal animals, but there are some species that are also active during the day. Discover a bat's sleeping patterns with helpful information...

Taking care of a bat involves setting it up in the proper environment and providing its natural prey, but bats are best suited under the care of zoos or conservation centers. Find out where to...

Humpback whales use a fishing technique called bubble netting, or lunge netting, to filter feed. Learn about the fish that humpback whales like to eat, such as herring, with help from an aquatic...

Whales catch food through the use of echolocation, which involves sending out a rhythmic clicking and buzzing noise that will bounce off objects, letting the whales know the distance between...

The beluga whale is an apex predator in the arctic marine food chain, and it mostly feeds on herring, cod, salmon and other arctic fishes. Discover how polar bears and humans can take over as the...

In terms of what whales eat, baleen whales swim through large groups of fish, shrimp, larvae and plankton, filtering the food and flushing out the water and sediment. Discover how toothed whales...

Monarch butterflies have four visible legs, two legs tucked under the head, bright orange wings and white spots over the whole body. Discover the features of both male and female monarchs with...

To find butterfly chrysalises and moth cocoons, look on branches, under leaves, near water and on plants that caterpillars like to eat. Locate chrysalises and cocoons before predators find them...

Taking care of a butterfly cocoon or chrysalis requires putting it in a large container in the springtime until it hatches or keeping it in a cool environment during the winter. Care for a...

Many different butterflies are yellow, but a two common ones are the Tiger Swallowtail and the Sulfur butterfly. Identify different species of yellow butterflies with information from a butterfly...

Butterflies usually hatch from their chrysalis cocoons in the spring, but they can hatch any time of year in tropical climates. Understand the variables that affect when butterflies hatch with...

Butterflies build chrysalis cocoons by finding a sheltered area, hanging upside-down and shedding its skin to expose the chrysalis. Discover the chrysalis stage of this insect's life with...