What happens when a raw egg is placed in vinegar?

Placing a raw whole egg in vinegar is a good experiment that teaches a fundamental principle of chemistry—the interaction between an acid and a base. Submerging a raw whole egg in a jar of white vinegar and refrigerating it for 72 hours produces a “rubber egg” because the vinegar dissolves the egg shell surrounding the

How exactly do astronauts poop and pee in space?

Ever since Yuri Gagarin was first launched into space on April 12, 1961, engineers and space travelers have had to answer the problem of how to go and where to put the waste. In the first years of the National Aeronautics and Space Administration (NASA), manned space flights were to be so short that the

How do things glow in the dark?

You see glow-in-the-dark things in all kinds of places, but it is most prevalent in toys. In the dark they will glow for 10 minutes. Usually it is a soft green light, and it is not really that bright. You need to be in almost complete darkness to notice it. All glow-in-the-dark products have phosphors.

Is human DNA different from that of chimpanzees?

When somebody tells you you are a monkey, they may be right. According a 2005 gene study, humans are 96 percent similar to the great ape species. The study showed that evolutionary speaking, humans did not go far enough when they descended from the apes. In effect, humans and apes are the same, from the

What are the smallest particles we know about?

For years, the only subatomic particles we know were protons, neutrons and electrons. However, by the 1960s, there had been evidence of hundreds of smaller constituent particles. These smallest particles fall under several main categories, notably fermions, hadrons and bosons. Fermions are what you call building-block particles. There are two types of material fermions: quarks,

Why do earthquakes happen?

Earthquakes are usually caused when the rock underground suddenly breaks along a fault. This sudden outburst of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. During the earthquake and afterward, the plates or blocks of rock

Why does oil float above water?

There are two factors why oil floats on water: Oil weighs less than water, making oil buoyant in water, similar to a cork or an air-filled rubber duckie that stays on the surface of the water in a bathtub or bucket. Many oils are less dense than water. Most oils do not dissolve in water,

Do salt and fresh water drown you in different ways?

Drowning in salt water is different than drowning in fresh water. Fresh water seems to be the more deadly variety, with more people drowning in fresh water every year than in salt water. Also, the time it takes for a person to drown in saltwater is between 5 to 30 minutes, while with fresh water,

Why are some people left-handed?

Researchers believe that the side of the preferred hand (which is, right versus left) is produced by biological and, most likely, genetic causes. According to studies, evolutionary natural selection has produced more people with speech and language control in the left hemisphere of the brain. Because the left hemisphere also controls the movements of the

Do babies dream?

At age 3 or 4, many children begin telling parents about their dreams. Some children might begin dreaming even earlier, and only talk about it later. But do newborns dream? In a classic study in 1966, a research team studied sleep waves in newborns. They discovered that not only do newborns dream (even as early