Known to be behind the characteristic odor of rotting eggs, sulfur is essential for all living cells. Cells make proteins that form strong chemical bonds called disulfide bridges between two adjacent sulfur atoms. These bridges give strength to our hair, outer skin, and nails. Eggs are loaded with sulfur because disulfide bridges are needed to form feathers, which explains why eggs smell on rotting. Because sulfur is easy to smell, natural gas lines—which are normally odorless—have sulfur additives to help people identify and smell a gas leak when it occurs.
Image by Dr. Edward Gafford.
Untitled, 2013, C-print, 91 1/2 x 71 inches
Untitled, 2014, Dye transfer print, 36 5/8 x 30 3/8 inches
Untitled, 2014, C-print, 79 3/4 x 63 inches
Photographs by Thom Sheridan
In 1986, the United Way attempted to break the world record for balloon launches, by releasing 1.5 million balloons, which resulted in two deaths, millions in lawsuits, and a devastating environmental impact.
"Every verso in this book has gone rather peculiar - looks like one of the cameras went haywire." Submitted by maedchenimmond.
Throughout Acta et Decreta Synodi Dioecesanae Strigoniensis, Celebratae Tyrnaviae 1629 by Peter Pazmany (1629). Original from Austrian National Library. Digitized July 27 2011.
by Dustin Adams
Sparkle palace cocktail table by John Foster
Iridescent surfaces, such as butterfly wings, help animals to elude potential predators. When these insects fly, the upper surface of their wings continually changes from bright blue to dull brown because the angle of the light striking the wing changes. As the butterflies move their wings up and down during flight, they seem to disappear, and then reappear a short distance away, looking like ethereal flashes of bright blue light. The dark undersides of their wings strengthen this effect. Combined with an undulating pattern of flight, this ability to change color quickly makes them difficult for predators to pursue.
The wings of butterflies and moths consist of a colorless translucent membrane covered by a layer of scales (the name of the order is Lepidoptera, meaning “scaly wings”). Each scale is a flattened outgrowth of a single cell and is about 100 µm long and 50 µm wide. The scales overlap like roof tiles and completely cover the membrane, appearing as dust to the naked eye.
The iridescence is caused by multiple slit interference. Sunlight contains a full range of light wavelengths. “Interference” occurs when light hitting the wing interacts with light reflected off the wing.
Light is a wave. If the crests and the troughs of the waves are aligned, or in phase, they will cause constructive interference, and iridescence is the result. One light wave hits the first groove, and a second light wave travels half of a wavelength to another groove, and is then reflected back in phase with the first.
If the crest of one wave meets the trough of another wave (out of phase), they will cancel each other out, as destructive interference occurs.
Spill 1-15, 2010
15 C-Prints, 42 x 28 cm each
SKIES THE LIMIT (LEAVE ME ALONE), 1998-2009
Hand painted, rainbow tie-dyed T-shirt, acrylic, graphite and oil, pastel on canvas, 96 x 75”
“Chromosaturation” (1965-present) is an environment composed of interactive color chambers that immerse the viewer in monochromatic color by Carlos Cruz Diez
Poster designed by Simon C. Page.