Hobbies & Science : Society & Culture & Entertainment
The buoyant force is what keeps boats and other floating objects from sinking. An object placed in water causes the water level to rise an amount equal to the volume of the object below the surface. Archimedes' principle states that the weight of the water moved by the presence of the object equals
Optical devices, such as telescopes or microscopes, use lenses to allow people to see objects that the naked eye could not see on its own. The quality of the optical device depends on various factors such as sharpness and distortion. To produce images, the lenses have resolving power and magnifying
This simple but effective design for a drawknife is reminiscent of the pioneer days, when scrap stock such as old barrel hoops and wagon-wheel rims were hammered flat and made into tools for use on the homestead. This type of drawknife was used to strip bark off trunks for fence posts, and to square
PPM stands for parts per million and is a measure of the mass of one substance in a volume of another substance. PPM can have actual units of milligrams per liter. Density is a mass per volume measurement. A mixed density takes into account the fractional composition of each component in a mixture.
Lakelake in pure nature image by .shock from Fotolia.comConroe, Texas, offers plenty of opportunities to take a tour of its land and beautiful body of water, Lake Conroe. Some of the tours are self-guided and some are guided by a paid professional. Conroe is home to diverse tree and bird...
A catapult is a machine used to hurl objects. Catapult is derived from the Greek "kata", which means downward, and "pultos", which is a small shield. The word katapultos is translated as "shield piercer." The catapult was invented in Syracus, Greece circa 400 B.C. Catapults are powered by torsion, t
There are two approaches to recreational softball, whether you play on a men's, women's or coed squad. One of them works; the other doesn't. The one that doesn't is the one that an unfortunate plurality of teams employ: compile a roster of miscellaneous non-connected friends and co-workers, give th
Macromolecules are polymers composed of many different subunits; the subunits are all linked together in a huge chain to make a bigger molecule. Biological macromolecules like DNA, RNA, carbohydrates, lipids and proteins are integral to life on Earth. Different subunits are used to construct each of
Over time, pennies become dull, dirty and somewhat disgusting. Penny collectors only want clean pennies in their collections, and it can be enjoyable for children to clean pennies as well. Sometimes it is necessary to clean pennies because they are so dirty as to be unusable. Many penny-cleaning for
A car's headliner is the piece of board attached to the ceiling of the vehicle that separates the interior ceiling from the roof itself. A headliner is typically covered in fabric or carpeting that matches the rest of the interior. One after-market upgrade that you can make to a vehicle is to switch
The "go green" movement has rapidly spread throughout communities around the world. However, many families don't recycle simply because they don't know the proper way to dispose of certain items. Glass jars are among the most common items overlooked because there's confusion surrounding what kind of
Windmills can be large and loud.Paul Edmondson/Photodisc/Getty ImagesWindmills are devices designed to generate electricity without using oil, gas or other fossil fuels, according to Clean Energy Ideas. Natural wind power causes turbines to spin, thus powering cable systems that are...
Nanotechnology is the manipulation of matter on the molecular and atomic levels. Current development is limited to the creation of nano-scale objects for use as materials in other technology. Material engineered using nanotechnology is often more precise and durable because of certain properties of
The Word Animal Foundation estimates that by the year 2025 one fifth of the world's animal species may be extinct. Hundreds of species are already gone, due in large part to human intrusion into their habitat. Logging, urban expansion, pollution of water and soil and mismanaged fishing and hunting h
Although your GPS may use complicated algorithms to get you from your office to your grandmother's house there still exist some simple ways to find the distance between two areas. A Greek mathematician named Pythagoras determined that the distance between any two points could be found by using the g
There are two common types of rock polishers, rotating tumblers and vibrating tumblers. Rotating tumblers take four to five weeks and produce smooth, rounded rocks. Vibrating tumblers take only a week and a half to two weeks and produce highly polished rocks that retain much of their original geolog
Hunting morel mushrooms is a favorite time-honored spring tradition in southwestern Ohio. Avid mushroom hunters know when it is time to pick up their walking sticks and mushroom baskets and head for the woods. They go by the calendar, the weather and other signs in nature, and also when their cabin