How to understand the principle of Archimedes, buoyancy and how it affects ships, divers, buoys, submarines, hot air balloons and other submerged and floating bodies.
Yes, it's a film title, but terminal velocity is also the maximum velocity reached by an object as it falls through a fluid. This article explains how it works.
Equation of a parabola, meaning of locus, directrix, focus, quadratic equation, maxima and minima etc.
A weed is an undesired plant in the wrong place. This guide helps you identify 22 of the the most common weeds you'll encounter in your garden—so you can love them or kill them!
Removing old seized screws from door hinges.
This second part of a two part tutorial covers integral calculus and applications of integration.
This first part of a two part tutorial covers the concept of limits, differentiating by first principles, rules of differentiation and applications of differential calculus.
Covering bases and exponents, laws of exponents. log to the base 10, natural logs, rules of logs, working out logs on a calculator, graphs of log functions, log scales and using logs to perform multiplication.
World of wonder fun science facts that every child should know! Covering space, nature, technology, engineering, elementary math, chemistry, physics and biology.
Levers can be found everywhere and have been used since ancient times. But why do we use them and what is the science behind how they work?
The binary or base 2 numbering system is the keystone of computer systems and digital electronics. This guide shows you how to convert from decimal to binary and binary to decimal
Tree stumps up to 9 inches diameter can be removed with minimal tools and a little patience. This guide shows you what tools you need and the steps involved
A 15-minute quick-and-easy recipe for making Irish brown soda bread with whole milk.
The base 16, hexadecimal numbering system is regularly used in computer coding for conveniently representing a byte or word of data. This guide shows you how to convert from hex to binary and binary to hexadecimal.
This guide shows you the math behind working out a bolt circle diameter (BCD) or pitch circle diameter (PCD) and gives tables you can use in your calculations.
This guide explains everything you need to know about circles, including calculation of area, segment area, sector area, length of an arc, radians, sine and cosine.
Follow this handy guide to learn how to set up your garden hose to an indoor or garden tap, as well as how to attach it to spray nozzles, sprinklers, pressure washers, and coiled hoses.
This guide gives basic common sense tips you can try in order to cut your energy use in the home, reduce CO2 emissions, save money and do your bit to save the planet!
An RCD or GFCI is a safety device designed to shut off power in the event of an electrical "leak." These devices can save your life and should be fitted to all extension leads.
When you can't scroll properly with your mouse, the cause can often be due to dust and fluff which has made its way into the wheel. This is really easy to clean with little effort
Solving triangles using Pythagoras's theorem, the cosine rule, the sine rule and various ways of calculating the area of a triangle.
Working out the odds of an event occurring allows us to estimate the number of times that event will take place in future trials. Permutations/combinations are also an important part of the analysis.
Do you want to get some upper body exercise? Well forget the chain saw and cut logs for your wood burning stove with a bow saw. Much safer than a machine and a great aerobic workout!
Alarm keypads and remote controls can eventually become unresponsive after years of use. You can use aluminum foil, conductive silver ink, or replacement rubber pads to give them a new lease of life.
A quick 10 tip checklist to follow if you can't get your stubborn lawn mower, snow blower or tiller to start. Learn how to start an engine properly and check the oil level.
A spigot (also known as a hose bib, bibcock or garden tap) leaks when the rubber washer inside wears away over time. Anyone with basic DIY skills can replace this. Only 2 tools are required.
Moss in a lawn competes with grass, looks unsightly and can make mowing more difficult. Fortunately it is easy to get rid of, and measures can be taken to prevent it
Willow is wonderful and extremely easy to grow from cuttings. This guide shows you how to propagate this useful plant.
A basic guide to pipe types, plumbing fittings, and thread sizes, and instructions for how to use fittings to connect copper, PVC, and PEX water pipes.
USB, heating, magnets, visual aids and cellphone screwdrivers. These 5 gadgets from DX.com come in really useful around the home!
Wheels can be found everywhere and have been used since ancient times. But why do we use them and what is the science behind how they work?
Plastics are ubiquitous and there are 3 types which are normally recyclable and identifiable by an imprinted code. There are at least 10 more plastics used in the home which you may not be aware of.
A step-by-step guide showing how to repair a leaking ballcock valve in the header tank in your loft. This guide also explains the layout of hot and cold pipes and valves used in home plumbing systems.
Weeds are unsightly and spoil a neatly tended garden or yard. Fortunately there are lots of ways to deal with them, either with chemicals or in a natural, environmentally friendly way
Google SketchUp Make is a simple to use, free, intuitive software application for creating basic 3D models. This 5 minute tutorial shows you how to create a simple 3D object
Ballistics is a branch of mechanics which deals with the motion of projectiles launched into the air or space. Solving these type of problems involves using Newton's equations of motion
Accurate square and mitered cuts in wood are essential for construction work. However, properly cut timber looks better even if you are just doing basic DIY and making stuff around the home.
How a burglar alarm system works. Control panels and wiring. Troubleshooting issues with false alarms, faulty contacts, PIR sensors, backup batteries, bells and sounders and keypads
Sharp tools make life easier because less effort is required to work with them. This guide shows you the correct way to sharpen a garden spade, hoe and other garden tools with an angle grinder
String trimmers, also known as line trimmers, weed eaters, weed whackers, and strimmers, can be troublesome garden tools. Difficulty in starting is often due to an issue with the carburetor.
Good quality photos enhance an article, blog, or other web page. Composition, exposure, focusing, depth of field, and perspective are just some issues that should be considered when taking photos.
This guide shows you how to wire a UK-style, standard 3-pin plug and select the correct fuse. These basic principles can be applied to wiring plugs from other countries, only the colours are different
You can buy "ready made" plants in a store, but it can be much more fun to grow them yourself from seed. The magical phenomenon of seed germination is entertaining for both adults and children alike. This step by step guide shows you how to sow poppy seeds and grow them on into mature plants.
Air tools compliment mains or battery powered tools and have several advantages over the latter. An air compressor and air tools are a useful addition to a home or commercial workshop
We often hear about analog and digital in the context of communications, sound recording and consumer electronic devices. But what exactly is the difference? This article explains the mystery
............D is for diaphragm, sucking air in and out E is for ear, sometimes big lobed and pointed F is for feet, to the knees they are jointed..............
Arduino is an open source hardware/software programming platform based around Atmel microcontrollers. Arduino boards with their analog and digital inputs are ideal for artists and electronic hobbyists
Did you know that plants can be cloned? You can make new plants for your garden using the technique of taking cuttings. For many plants, this process is simple and only takes minutes to do.
This easily prepared soup is tasty, nutritious, and only takes about 30 minutes to make (but a bit longer to do the washing up!).
Planting a tree or shrub involves both proper preparation and care. This article guides you through 8 easy steps to help your plant flourish.
When working on a document, it's useful to be able to keep another window always on top of the active window. This saves having to constantly switch backwards and forwards between applications.
There are many ways of increasing traffic and promoting your blog or webpage. It all boils down to writing good quality content and getting the word out to all those potential billions of readers.
Does your trimmer line get tangled, snap off and wind you up? Read on for tips on how to wind the spool properly and use a trimmer like a pro...........
I try pressing "0", "#" and "*" and whistling down the phone to confuse the software. Sometimes this works and you get routed to an operator. Not this time though!
"Hot" and "neutral" supply power to an appliance, so why the need for a "ground" wire? Basically, it's included for safety reasons. This article explains how it all works....
Changing the oil in your mower helps to reduce wear and prolongs the life of the engine. Anyone with a small amount of technical aptitude can learn to do this, and few tools are required.
Eczema is a distressing condition that causes the skin to become itchy, red, dry and cracked. It afflicts children and adults alike.
Is your grass getting out of hand, causing your flower beds or lawn borders to look unkept and messy? This guide will help you edge your lawn with a knife for a clean, sharp finish.
Damp can be a serious problem in homes leading to mildew on walls, ceilings, curtains, and clothing. It has several causes but can often be remedied or reduced in severity.
A guide to different lighting types in the home and their pros and cons. Covering incandescent, halogen, fluorescent, CFL, sodium, metal halide and LED.
Useful cleaning, plumbing, painting, and electrical tips for around the home and garden - updated as I think of more! Also ways in which you can recycle stuff by re-using it for a different function.
We all know about YouTube, Social Networking sites such as Twitter and Facebook and Article sites like this one. This is a list of novelty and fun websites I have come across over the years.
This guide shows you how to use the numerous historical records that are now available free online, including the 1901 and 1911 censuses, church and civil records, gravestone inscriptions, ship passenger records, and large-scale townland maps.
The basics of mechanics, covering forces, mass, acceleration, motion, friction, torque, weight, vectors and laws of motion.
Yes I'm addicted to flashlights! As if being addicted to power tools wasn't bad enough, I can't pass a display in a store now without drooling over the display of torches and thinking "Hmm, that would be a nice addition to my collection!"
Beef patties are delicious at any time, especially when they are sandwiched between layers of cheese, sliced onion and iceberg lettuce to form a burger. This recipe for patties (which I plagiarized from my mother!) includes rolled oats as one of the ingredients. Oatmeal is high in dietary fiber and...
Knowing what knot to tie is a useful skill in the home or garden, or when fishing or camping. How to tie reef(square), bowline, sheet bend and figure-of-eight knots.
When drilling any type of material, it's vital to use the correct bit to ease drilling and also to prevent bit damage. Drill bits are available for metal, masonry, tiles, plastics, glass and wood.
Concrete is really easy to make and all you need is a shovel and some buckets. This is a comprehensive, step-by-step guide with pictures showing you how to make concrete by hand, with or without a mixer
There are various types of batteries on the market today. Different sizes, different technology, different voltages, rechargeable, and single-use disposables. So how do you know which to use? This guide covers lithium ion, nickel metal hydride (NiMh), nickel cadmium(NiCd), zinc carbon and alkaline
The first practical steam engine was developed by Thomas Newcomen in the early eighteenth century. Steam was one of the driving forces behind the industrial revolution, allowing mills and other factories to be located away from rivers.
Vinegar is a natural substance containing acetic acid. It has a wide range of uses, including cleaning around the home, dietary, personal health and hygiene and as a garden pesticide and herbicide.
10 Tips on how to enjoy life, be happy and have a positive mental attitude!
This guide gives you some ideas about colorful and easy to grow perennial and annual flowers for planters and flower beds in your garden. None of the plants are particularly fussy and many can be grown easily from seed
Most gardeners will be aware of the benefits of using a compost bin for disposing of garden and kitchen waste. Branches can also be recycled into useful material using a small electric chipper.
Contacts lenses provide better quality of vision than glasses, and they also provide more freedom for physical activities. Here is my experience of contact lenses—the joys and the pitfalls!
Thinking of buying a power tool as a gift? Or maybe it's for yourself to make DIY easier. This guide for the absolute beginner outlines the various tools available, their capabilities and what to buy
Which appliances use the most electricity? This article lists over 20 common appliances with running costs and shows you how to calculate kilowatt hour usage of any device.
What causes electrical faults in the home? Miniature Circuit Breakers (MCB), Ground Fault Interrupters (GFI), Residual Current Devices (RCD), electrical panels and resetting breakers when they trip.
If you're considering a vacation in the Emerald Isle, why not take a virtual preview tour on Street View and be back by dinner? In this guide we visit the Cliffs of Moher, Kilkenny medieval city, Killarney National Park and more.
This article teaches you how to measure power with an energy monitoring adapter to save both power and money.
A comprehensive guide showing how to use a multimeter or DMM. A multimeter is a useful instrument in a home toolkit for measuring voltage, current and resistance and also for tracing breaks in wires, testing diodes, capacitors and fuses.
Skype is a computer communications program that enables free voice/video calls between two computers with an Internet connection. You can also make international calls at the cost of a local call.
This guide provides some tips on what to look out for when buying walk behind push lawn mowers. It covers topics such as lawnmower type, horsepower, width of cut and deck type
The Hikoki C7SB2 is the best circular saw I have ever used and with a power rating of 1700 watt, it makes light work of cutting through lumber! Ideal for the pro or serious DIY
This absolute beginner's guide covers all the tools you'll ever need to maintain your garden, ranging from rakes, spades and hoes to secateurs, lopping shears and powered hedge trimmers.
A fire in the home can be a devastating event, damaging property and possibly causing death or personal injury. This guide outlines the most common causes of fires and how to prevent them.
The binary numbering system is the basis for storage, transfer and processing of data in computers and other electronic systems. It uses base 2 rather than base 10 which we are normally familiar with
Repairing a bicycle puncture is relatively simple, requiring few tools. It should be possible to perform a repair in about 30 to 40 minutes. This pictorial guide shows you how to remove a wheel and tyre, locate the hole in the tube, patch it and put everything back together.
Why do all cleaning products have to be perfumed? Why are cookie tin lids rectangular and not square?... and don't get me started on health and safety!
Learn how to create luxurious garden compost! This is a great way to recycle organic matter (such as kitchen waste), save money and have greater success in growing plants and vegetables!
Electricity 101. A complete beginner's guide covering watts, amps, volts, ohms and kWh. Cost of running appliances. AC, DC and three-phase. Resistivity of materials. A description of electric and magnetic effects of current flow in a conductor.
Learn about starting a mower properly, solving fuel, oil and ignition system problems, carburetor fault finding and lots more troubleshooting tips.
An angle grinder is a useful power tool for cutting and grinding metal and other materials. Like any power tool, it can be dangerous if used incorrectly. This guide shows you how to reduce your risk of injury while using an angle grinder.
Working at a height can be hazardous. This guide provides some tips on how to stay safe while working up a ladder, how to erect it, and safety tips for working on roofs.
You can earn money on the Internet by selling your photos to royalty free image stock agencies. This hub outlines which are the best sites to upload to and gives advice on what to upload.
Learn how to keep your home snug and warm in the winter, and protect your home, yard and plumbing from cold, wind, rain, and snow.
A humorous account of spilling coffee over a laptop. Details on how to clean it.
Intense throbbing head pain, nausea, aversion to bright light, sounds, and other stimuli—these are classical symptoms of a migraine. Prophylactic treatment may be a help.
How do you put up shelves, cupboards, brackets or coat hangers on a wall? This guide explains how to drill walls and outlines the tools, fixings and drill bits required.
Common sense, low and high tech tips on how to improve your home security and prevent burglars breaking into your home.
DIY can save you money and gives you a great sense of achievement. This article outlines the essential hand and power tools a homeowner needs for basic and more advanced house maintenance.