Group items tagged

1925-1926   Introduction of lightweight, air-cooled radial engines The introduction of a new generation of lightweight, air-cooled radial engines revolutionizes aeronautics, making bigger, faster planes possible.

  1917   The Junkers J4, an all-metal airplane, introduced Hugo Junkers, a German professor of mechanics introduces the Junkers J4, an all-metal airplane built largely of a relatively lightweight aluminum alloy called duralumin.

1904   Concept of a fixed "boundary layer" described in paper by Ludwig Prandtl German professor Ludwig Prandtl presents one of the most important papers in the history of aerodynamics, an eight-page document describing the concept of a fixed "boundary layer," the molecular layer of air on the surface of an aircraft wing. Over the next 20 years Prandtl and his graduate students pioneer theoretical aerodynamics.

1933   First modern commercial airliner In February, Boeing introduces the 247, a twin-engine 10-passenger monoplane that is the first modern commercial airliner. With variable-pitch propellers, it has an economical cruising speed and excellent takeoff. Retractable landing gear reduces drag during flight.

935   First practical radar British scientist Sir Robert Watson-Watt patents the first practical radar (for radio detection and ranging) system for meteorological applications. During World War II radar is successfully used in Great Britain to detect incoming aircraft and provide information to intercept bombers.

1937   Jet engines designed Jet engines designed independently by Britain’s Frank Whittle and Germany’s Hans von Ohain make their first test runs. (Seven years earlier, Whittle, a young Royal Air Force officer, filed a patent for a gas turbine engine to power an aircraft, but the Royal Air Ministry was not interested in developing the idea at the time. Meanwhile, German doctoral student Von Ohain was developing his own design.) Two years later, on August 27, the first jet aircraft, the Heinkel HE 178, takes off, powered by von Ohain’s HE S-3 engine.

  1939   First practical singlerotor helicopters Russian emigre Igor Sikorsky develops the VS-300 helicopter for the U.S. Army, one of the first practical singlerotor helicopters.

“Do you think we need a bigger truck?”

our biggest need is a clearer focus on how we should value and use what we already have.

But to what purpose?

“knowledge of words, and ignorance of the Word,” in which “wisdom” is “lost in knowledge” and “knowledge” is “lost in information”

We have thousands of times more available information than Thomas Jefferson or Abraham Lincoln. Yet which of us would think ourselves a thousand times more educated or more serviceable to our fellowmen than they?

I could never complete my assigned task within the available time unless I focused my research in the beginning and stopped that research soon enough to have time to analyze my findings and compose my conclusions.

we must begin with focus or we are likely to become like those in the well-known prophecy about people in the last days—“ever learning, and never able to come to the knowledge of the truth” (2 Tim. 3:7).

But a bale of handouts can detract from our attempt to teach gospel principles with clarity and testimony.

Stacks of supplementary material can impoverish rather than enrich, because they can blur students’ focus on the assigned principles and draw them away from prayerfully seeking to apply those principles in their own lives.

Each of us should be careful that the current flood of information does not occupy our time so completely that we cannot focus on and hear and heed the still, small voice that is available to guide each of us with our own challenges today.

Our priorities determine what we seek in life.

“a man’s life consisteth not in the abundance of the things which he possesseth”

Our priorities are most visible in how we use our time.

Good choices are especially important in our family life. For example, how do family members spend their free time together? Time together is necessary but not sufficient.

I believe many of us are overnourished on entertainment junk food and undernourished on the bread of life.

The amount of knowledge in the world has doubled in the past 10 years and is doubling every 18 months according to the American Society of Training and Documentation (ASTD). To combat the shrinking half-life of knowledge, organizations have been forced to develop new methods of deploying instruction.

Technology is altering (rewiring) our brains. The tools we use define and shape our thinking

example of a Maricopa County Community College system project that links senior citizens with elementary school students in a mentor program. The children “listen to these “grandparents” better than they do their own parents, the mentoring really helps the teachers…the small efforts of the many- the seniors – complement the large efforts of the few – the teachers.” (2002). This amplification of learning, knowledge and understanding through the extension of a personal network is the epitome of connectivism.