Who invented the television?

1929-Western-Television

Philo Farnsworth was just a fourteen year old high school student when he came up with the idea that an electron beam could scan pictures back and forth and transmit them to remote screens- in other words, he thought up TV! While such an amazing invention could not be the work of one man alone, […]

Who invented the telephone?

alexander_graham_bell

Alexander Graham Bell invented the telephone in 1876. The first words he spoke on his telephone were, “Watson, come here. I need you.” Watson was his assistant’s name. That happened in 1875-76. However Antonio Meucci had a working telephone since 1848 in Havana and a perfected model by 1871. On that year Meucci filed for […]

Does the water in a bath or sink go a different way down the drain depending on which hemispere you are in?

Water spiraling down a drain

Yes the water will drain in different directions depending on which hemisphere you’re in.   Usually this question is asked about toilet flushing, but I guess it’s still fun to answer even though you’re more interested in baths and sinks draining. Water will drain in different directions depending on the hemisphere due to the Coriolis force, […]

As you drink an ice-cold beverage on a warm day, the outside of the glass or bottle becomes wet. Why?

water-glass-condensation

Water forms on the outside of a cool glass on a hot day due to condensation.  The air around us has water in it; the water is in a gaseous form, commonly called water vapor.  Typically, the hotter the day is the more water is evaporated into the air. When you have a glass with […]

Why does air cool as it rises through the atmosphere?

clouds

The first thing we must realize is that temperature and heat are two different things, they’re closely related but one can be affected while the other is not.  We all know that warm air rises, if it didn’t the people in hot air balloons would be in trouble.  This warm air will cool as it […]

Why do the earth’s oceans appear blue from the moon?

earth_from_space

The earth’s oceans and sky both appear blue to everyone who observes them. They do this because water absorbs blue light less strongly than it absorbs other colors. When ocean water is exposed to sunlight (white light), it absorbs most of the red light quickly and a good fraction of the green light. But the […]

What is infrared light?

infrared-cat

Infrared, visible, and ultraviolet light are all electromagnetic waves. However these waves differ in both their wavelengths (the distances between adjacent maximums in their electric fields) and in their frequencies (the number of electric field maximums that pass by a specific point in space each second). Infrared light has longer wavelengths and lower frequencies than […]

How do submarines sink if they have air inside?

submarine

The net force on the submarine depends on its average density, not on the density of one of its constituents. If the average density of the submarine is less than that of water, it will float upward in water. If the average density of the submarine is more than that of water, it will sink […]

When running in the rain, would you get wet faster if the rain were falling diagonally or straight down?

Rain-Run

Mythbusters did a segment in which they compared walking in the rain to running in the rain; it turns out that you would get wetter by running in the rain.  They’d probably be interested in doing this experiment as well, but since they haven’t I guess I’ll have to take my best guess at this. […]

Is the Bell 206 Jetranger still in production today?

heli

Unfortunately, some good things must come to an end, the Bell 206, JetRanger is one of them.   Although a popular , an useful,  mid-size helicopter…Bell Helicopter Textron decided to cease production, moving on to promote the ”407”, A multi-bladed med-size helicopter, to make more money. The 206, ”Jetranger”, from private use…F.A.R.PART 91……TO F.A.R. PART 135 Air […]

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