Science & Math

How many stars are visible in the sky, on a clear night?

There is a surprisingly simple answer to your great question: Each month we see different stars, so to answer for a specific night of the year at your specific location on Earth depending on your eyesight and how bright the city …

Why do so many drug names end in 'HCL'?

Isn't HCL Hydrochloric Acid? Is this some kind of binder to hold ingredients together? I'm just curious as I see this on commercials all the time. Many drugs are practically insoluble in water, yet they are basic.   Such…

Why is the moon white?

Light from the Sun is reflected off of the Earth  onto the Moon. Some of this light is then reflected off of the Moon back towards the Earth.   Because of this we see part of the Moon illuminated by the Sun and the rest of the Mo…

How can I effectively learn to survive a streetfight?

You can train and plan all you want but a plan only last till the first moment of execution then it starts slowly falling apart.  But any training that you do gives you an advantage.  Building muscle memory is the most important …

Why do people that travel through the desert see water/oasis?

This known as a mirage.   Very simply the hot air rising from the desert surface causes light (which travels in straight lines) to be defracted (this means that the line of travel changes when moving from cold air to hot air and …

How do air con work?

An air conditioner has an air circulation fan that take in room air and blows it back out to the room without cooling it.   When you turn the AC to "cool" it growls as the refrigerant cycle kicks in.   The cycle has fou…

Can eating right before sleeping cause nightmares?

Good question, my dad always used to tell me this, here's what happens eating right before sleep causes you to fall into deep sleep very quickly, but here's what happens because are asleep so soon after eating, your body …

How long it take sun light to reach all the planets?

Allowing that the speed of light is 186,000 mps, then: Mercury (36) = 3 1/2 minutes Venus (67.2) = 6 minutes Earth (93)   = 8 1/2 minutes Mars (141.7) = 13 minutes Jupiter (484) = 43 minutes Saturn (887)  = 1 hour, 19 minute…

What's the maximum current for LPT cable?

What is the maximum allowed current [in mA] for the wires of an LPT cable? The cable is 1.8 meters long. Maximum current would depend on the gauge, type, and quality of wire used to make the cable.   Not all cables are made the …

How can scientists know age by carbon tests?

Remember... The earth is flat... Because they said so... If you don't agree... OFF WITH YOUR HEAD! Seems like truth goes through same steps; first hated, then spoken out against, then tried to be destroyed, then accepted by a…

How can you test serotonin levels?

Seratonin: The chemistry of Well-Being    More than 100,000 chemical reactions go on in your brain every second! The brain is also a radio transmitter, which sends out measurable electrical wave signals. In fact the brain continu…

How a Sub-Woofer works?

Sub-Woofer Technology A sub-woofer is a speaker optimized to reproduce non-directional low frequencies. These are usually the sounds made by exploding space ships, (never mind there is no sound in outer space) the rumble of machi…

When did DNA testing start?

Milestones in DNA History 1869 Johann Friedrich Miescher identifies a weakly acidic substance of unknown function in the nuclei of human white blood cells. This substance will later be called deoxyribonucleic acid, or DNA. 1912 …

How do I beat a polygraph test?

Polygraph is Quackery Scientists overwhelmingly agree that polygraph "testing" is junk science. The only "raging debate" pits people who don't yet understand that it's flimflam against the growing numb…

What is the difference between UNIQUAC and UNIFAC models?

Theories of Solutions : Excess functions (and consequently activity coefficients) can be obtained from equations of state. However, this approach has limited practical applicability. Lattice Models : Liquid is considered to be a …

Are they any legit lottery sweepstakes?

A sweepstake is technically a lottery in which the prize is financed through the tickets sold. In the United States the word has become associated with promotions where prizes are given away for free. In other words, they specifi…

New agricultural techniques?

Domestication of plants is done in order to increase yield, improve disease resistance and drought tolerance, ease harvest and to improve the taste and nutritional value and many other characteristics. Centuries of careful select…

How to patent an invention?

Here are some steps you need to take: Consult a patent lawyer and check if your idea can be patented.  Keep extensive records tracking the development of your idea. Conduct an extensive research to find out if there are similar p…

What type of foods is less harmful to the environment?

Eating lower on the food chain is also important.  When you eat a diet that is high in meat, you must realize that it takes a lot of agriculture land to support all of those animals.  Most of that energy is lost (as waste and hea…

What qualities do you need to become a scientist?

In order to be a biologist, you need to take a major in biology or biochemistry (I would recommend biochem, because it's more rigorous and harder to learn later in your career), then, assuming you want to be an independent sc…

Load More
That is All