Science & Technology

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Explaining Gravity to Kids

At first blush, gravity seems like a simple enough concept to explain, but the plot thickens when you consider that no one knows what it actually is. Scientists know enough about it to satisfy a child's curiosity, however, and you can convey this knowledge in simple terms without resorting to explanations on the level of "the Earth sucks." It helps to appeal to personal experience as well as to innate curiosity about the cosmos.

Objects Fall at the Same Speeds

Your child may have noticed that some heavy things fall faster than light ones, so explaining that, actually, everything falls at the same speed should be an attention getter. Gravity depends on mass, but the mass of the earth is so big that masses of smaller objects don't matter. It's air resistance that slows down fluffy things, such as feathers. You can illustrate this by dropping two dense round objects with obviously different masses, such as a marble and a softball, from a second story window and having the child verify that they hit the ground at the same time. Prepare for a look of disbelief when you explain that, in the absence of air, a feather would fall just as fast.

Distinguishing Mass and Weight

After having convinced the young scientist that objects fall at the same rate, it's a good time to clarify that, even though acceleration due to gravity is constant, the gravitational force on each object is different. That force is a product of the acceleration due to gravity and the object's mass, and we call this force the object's weight. Weight and mass aren't the same things, although by convention we use units of mass to measure weight. Mass is the amount of matter an object contains, while weight is a measure of the force of gravitation on the object. If you were on the moon, your mass would be the same, but you would weigh less.

The Effect of Gravity on Planets

Drawing the child's attention to a picture of stars or planets, explain that the gravitational force is universal, which means it affects everything, and that it's the force that keeps planets orbiting around each other. The gravitational force between two bodies strengthens when the mass of either one increases, or when they get closer together. In mathematical terms, the gravitational force between two bodies varies directly with mass and inversely with the square of the distance between two bodies. Gravity is like a string connecting two bodies and keeping them together; if they get too close, gravity forces them to collide, and they may stick together. That's how planets are formed.

OK, So What Exactly Is Gravity?

The time will come to disclose the nature of this mysterious attraction that everything in the universe has for everything else, but alas, the answer isn't straightforward. It may result from the curvature in the fabric of space-time that every body creates by virtue of its mass, or it may be caused by the exchange of fundamental particles as yet undetected, called gravitons. Whatever causes it, gravity is extremely weak compared to other fundamental forces, such as the electromagnetic force. To illustrate this, simply pick up a paperclip with a magnet to illustrate that the magnetic force in the tiny magnet is stronger than the gravitational attraction of the entire earth.


Medicine is the science and practice of the diagnosistreatment, and prevention of disease. Medicine encompasses a variety of health care practices evolved to maintain and restore health by the prevention and treatment of illness. Contemporary medicine applies biomedical sciencesbiomedical researchgenetics, and medical technology to diagnose, treat, and prevent injury and disease, typically through pharmaceuticals or surgery, but also through therapies as diverse as psychotherapyexternal splints and tractionmedical devicesbiologics, and ionizing radiation, amongst others.[1]

Medicine has existed for thousands of years, during most of which it was an art (an area of skill and knowledge) frequently having connections to the religious and philosophical beliefs of local culture. For example, a medicine man would apply herbs and say prayersfor healing, or an ancient philosopher and physician would apply bloodletting according to the theories of humorism. In recent centuries, since the advent of modern science, most medicine has become a combination of art and science (both basic and applied, under the umbrella of medical science). While stitching technique for sutures is an art learned through practice, the knowledge of what happens at the cellular and molecular level in the tissues being stitched arises through science..... for more info check

and other Educational and web  resources....

Alternative Medicine

Prescientific forms of medicine are now known as traditional or Alternative medicine . It has been stated that Newer proponents often suggest that traditional or alternative medicine can be used together with functional medical treatment, in a belief that it will complement (improves the effect of, or mitigates the side effects of) the treatment. A Question to askis  which Medicines, Medical proceedures, and Rehabilitation services ( Physical Therapy  <-click link for further explanation) work best with these Traditional or Alternative Medicines?

References for paragraph: 

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3 Free Powerful Apps for Drawing on Your Android Device

These are not your typical drawing apps. These are powerful applications that can aid professionals who want to use their Android smartphones or tablets for creating and touching up their digital artworks. What's great is that these drawing apps can be downloaded for free from the Google Play store.

SketchBook Express (Autodesk Inc.)

With the SketchBook Express app on your Android device, you can sketch and paint digital art using the app's advanced set of brushes and pencils. There are 15 built-in brushes, four drawing styles, a color wheel, and multiple layers with a dedicated opacity control. Other useful features of SketchBook Express include measuring via a virtual ruler, adding on text and using the free-transform tool for the current layer you're working on, as well as dynamic symmetry drawing, which enables you to preview the complex symmetrical geometry of whatever you're working on while you are drawing it. You can save your digital artwork on the multimedia gallery of your Android device or upload it directly to deviantART, the social networking site for artists.

ScribMaster (Alstapp Note & Draw)

With ScribMaster, you work with scalable vectors, which are a far cry from a pixel-based paint engine. With vector-based drawing in SVG, there is no pixelation even when you zoom in on specific areas to work on the intricate details of your drawing. Features of the free ScribMaster app include toggle visibility on layers and transparency control, plus a good selection of brushes, pens and other tools.

Painter Mobile (Corel)

This powerful mobile app version of Corel Painter comes with 16 brushes, blenders and sprayers for applying effects, as well as digital art tools for drawing with chalk, charcoal, pencils, pens and watercolors. The free Painter Mobile app lends maximum flexibility with its customizable brushes and blender brushes for mixing colors. The simulated canvas interface has a clean, intuitive design, enabling you to sketch, draw and paint without distractions.

The aforementioned drawing apps have been handpicked for their advanced features. So, if you're a professional artist looking to boost your productivity by using your mobile device to create digital art anytime, then you can rely on SketchBook Express, ScribMaster or Painter Mobile.

Running Out of Data? - 3 Things That Could be Sucking Your Data Plan Dry

by beconrad

Getting the right data plan is one of the most challenging parts of choosing a cellular plan. If you choose a plan with too little data, you could face steep overage charges or find speeds on your unlimited plan throttled. If you choose a plan that includes too much data, you are just throwing money away -- money you could be using to pay other bills or save for the future.

It helps to know how much data you use. Reviewing your past usage can give you a sense of how much data you may use in the future. The trouble is that new apps and new capabilities can quickly change the equation -- and the amount of monthly data you use. Some apps and activities can use up far more of your data allotment than you might think.

Streaming Music

Streaming music services like Spotify, Rdio and Pandora turn your humble cell phone into a great radio, but they do so at a cost. These streaming music services can use a lot of data, and it is easy to lose track of just how much bandwidth you are consuming.

If you are keeping an eye on your data usage, you might want to restrict the use of streaming music services to times when you are connected to a home or public Wi-Fi network. In the meantime, you can download your favorite tunes to your smartphone or play previously purchased music.

Free Texting Plans

There are plenty of free texting apps for smartphones, including industry-sponsored apps like Google Voice and Apple iMessage and third-party apps like WhatsApp and TextFree. These apps are very useful, and when used properly they can actually conserve your precious data.

The key is to restrict the use of such apps to text only. Straight text messages are so small it would take thousands of them to make a dent in even the most restrictive data plan. However, if you use the apps to send photos, videos and other high-bandwidth data, you can expect your data usage to soar.

Facebook Sharing

Facebook is one of the most popular destinations for smartphone users, but it can really eat into your data plan. Making status updates and keeping up with your friends will not take much data, but viewing and sharing media files certainly will.

If you spend a lot of time viewing embedded videos or sharing your favorite clips, you could easily go over your data limit by the end of the month. A good solution is to save the clips you want to play for later and watch them when you reconnect to your Wi-Fi network at home.

Controlling the amount of data you use can be difficult, especially in this media-saturated world. Smartphone plans can be complicated and confusing, and avoiding overages can be hard. Understanding what is causing your data usage to spike is the best way to keep your bills under control.

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