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Xkcd - A Webcomic - Outreach. How Big is a ... ? The head of a pin is about 2mm in diameter.

How Big is a ... ?

Use this animation to compare the relative sizes of cells and organisms sitting on a pinhead. Nearly invisible without magnification, dust mites dwarf pollen grains and human cells. In turn, bacteria and viruses are even smaller. How to Use. How to Make Lava Lamps - Oozing Goo. Make Your Own Lava LampIf you're a going to attempt to make your own lamp, we have all the formulas here.

How to Make Lava Lamps - Oozing Goo

First I should say that the experience can be fun but it is not neccessarily cheap. As a matter of fact, just buying a new lamp is probably cheaper. On the other hand, the obsessively inquisitive won't sleep until they crack the code! The difficult part about making your own liquid motion lamp is, of course, the motion. We won't go into the lamp base too much. Read our disclaimer and then choose your poison below. How to Make a Lava Lamp with Household Ingredients. Edit Article With Vegetable Oil and WaterWith Mineral Oil & Alcohol Edited by Sondra C, Nicole Willson, Jack Herrick, Krystle and 100 others Have you ever caught yourself being hypnotized by a lava lamp?

How to Make a Lava Lamp with Household Ingredients

You hold it in your hand, move it slightly, and watch as the liquid quivers and separates into different shapes and colors. Biological classification keywords. Food Web - Menu. Science Made Simple. Fantastic Fluid Flow Take a beaker of water and a beaker of golden syrup and turn them upside down.

Science Made Simple

Aside from making an enormous mess, you will notice that very different things are happening to each one. The water empties quickly in an… Entrancing Vortices A vortex is a rapidly whirling spiral of fluid or gas rotating around its own centre. The Science of Sound Our hearing is one of our most important senses, necessary for basic communication, speech and awareness. Astonishing Diffusion Diffusion is the movement of something from an area of high concentration to a lower concentration. What is Thunder? Thunder is the sound that accompanies lightning during a thunderstorm. Magnificent Microscopes A microscope is an instrument that, using lenses, can be used for viewing objects that are too small to be seen by the naked eye.

Fantastic Fractals What is a fractal? Deep Diving Ketchup Sachet Confuse your Legs Toothpick Trick. Emerald tree boa. Why Is Biodiversity Important? Who Cares? — Printer friendly ver. It was noted earlier that ecosystems provide many services to us, for free.

Why Is Biodiversity Important? Who Cares? — Printer friendly ver

Although some dislike the thought of trying to put an economic value on biodiversity (some things are just priceless), there have been attempts to do so in order for people to understand the magnitude of the issue: how important the environment is to humanity and what costs and benefits there can be in doing (or not doing) something. Map: Biodiversity hotspots. Much of the Earth's species diversity is concentrated into a few relatively small areas.

Twenty-five regions have been identified which together cover only 1.4% of the Earth's land surface but contain nearly half of all plant species and a third of all terrestrial vertebrate species. All are under pressure from human activities. BBC News Online looks at range of biodiversity hotspots. California Floristic Province. Show Me Science - The Importance of Biodiversity. Biodiversity - from "The Wild Classroom" What is New Zealand's Biodiversity - Biodiversity. Biodiversity is shorthand for “biological diversity" - the number and variety of organisms found within a specified geographic region; and the variability among living organisms on the earth, including the variability within and between species and within and between ecosystems.

What is New Zealand's Biodiversity - Biodiversity

Elements of biodiversity include: Genetic diversity – the varied genetic make-up among individuals of a single species Species diversity – the variety of species within a particular geographic area, such as the birds, fish, insects, bacteria and plants that live within a wetland Ecological diversity – the variety of ecosystem types (such as forests, deserts, wetlands, grasslands, streams, lakes and oceans) and the communities within them.

These communities interact with each other and with the non-living environment. For example, the mountain stone weta contains a form of anti-freeze in its tissue to avoid the damage caused by ice crystals in its body. Department of Conservation. Electrical curriculum: watts, ohms, volts, and amps. A quantity of charge is measured in units called COULOMBS, and the word Ampere means the same thing as "one Coulomb of charge flowing per second.

Electrical curriculum: watts, ohms, volts, and amps

" If we were talking about water, then Coulombs would be like gallons, and amperage would be like gallons-per-second. What flows inside wires? It has several names: Charges of electricity Electrons Charged atoms (ions in salt water etc.) Electric charge Electrical substance The Electron sea The ocean of charge Electric fluid "Charge-stuff" Why are Amperes confusing? If we'd never learned the word "gallon", and if we had no idea that water even existed, how could we hope to understand "flow? " We only can understand the electrical flow in wires (the amperes) if we first understand the stuff that flows inside wires. "Charge" is the stuff inside wires, but usually nobody tells us that all metals are always jam-packed full of movable charge.

Design & Technology on the Web - Resources and help for stud. D&T Online:electronics menu.