Worth a Look Archive - Page 2

Exploratorium Magazine Online: Exploring Origami - Oct 1, 2012

Check out Exploratorium Magazine Online: Exploring Origami to learn about recent advances in the art of origami. Don't miss the video of folding interlocking rings out of one sheet of paper. Also, you'll find out how the paper crane became a symbol of peace in Japan.

Mars--NASA Explores the Red Planet: Program Overview - Sep 1, 2012

Click on Mars--NASA Explores the Red Planet: Program Overview to see the first close-up image of Mars, captured by the Mariner spacecraft in 1965, and to learn about NASA's strategy for investigating the red planet. If you click on "Science Overview," and then on "Goal 4," you can find out how NASA plans, over the next decade, to study the challenges of human spaceflight.

Surface Properties of the Moon - Aug 1, 2012

Check out Surface Properties of the Moon for more on the moon's craters and surface material.

Ionizing Radiation and Humans – The Basics - Jul 1, 2012

Radioactivity is all around us--in soil, rocks, and even food--but small doses of it are not harmful. Visit Ionizing Radiation and Humans – The Basics to learn how exposure to radiation is part of our daily lives.

For more, check out this Fact Sheet from the Health Physics Society. Also see, from a previous Physics at Home, Calculate Your Radiation Dose.

Music Acoustics: How does a guitar work? - Jun 1, 2012

To learn more about the physics of the guitar, including acoustic guitars, visit Music Acoustics: How does a guitar work?.

Torque - May 1, 2012

Check out this PBS video to use the concept of torque to explain how one dancer can balance on top of the head of another--and on point!

(This feature was updated on December 28, 2013.)

Hyperphysics: X-ray tube - Apr 1, 2012

X-ray tubes work by firing electrons at a metal plate in a vacuum. When an electron passes near the nucleus of one of the atoms in the plate, it is accelerated and emits x-rays, as shown in the drawing on this Hyperphysics page. To learn more, visit Hyperphysics: X-ray tube.

Molecular Chirality - Mar 1, 2012

Both amino acid molecules (the building blocks of proteins) and sugars can be right- or left-handed, and the way they react chemically depends on their handedness. To find out how handedness is important in our diet, and in drugs, visit Molecular Chirality.

Space Topics: Extrasolar Planets--Searching Methods - Feb 1, 2012

There are five ways to detect an extrasolar planet:
--observing periodic changes in the frequency of the spectra lines at the star emits
--observing the periodic dimming of the star when the planet passes in front of the star
--observing periodic changes in the position of the star the planet orbits
--observing an enhanced image of the planet with gravitational lensing
--making a "direct" image of the extrasolar planet

Astronomers now believe our galaxy has more planets than stars--see this BBC Report.

(This feature was updated on September 21, 2013.)

How Airplanes Fly: A Physical Description of Lift - Jan 1, 2012

Visit the Florida International University site How Airplanes Fly: A Physical Description of Lift to understand how the wing of an airplane produces lift. You'll see that the frequently-given explanation based on the Bernoulli principle is not correct.

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