Caribbean Amphibians Started with a Single, Ancient Voyage on a Raft from South America
Credit: Blair Hedges, Penn State Red frog from mountains of Haiti. Eleutherodactylus audanti, from Massif de la Selle.
How to Rip and Tear a Fluid
Credit: J. Gladden, A. Belmonte (Penn State) Birefringent visualization of the micellar fluid layer around a diagonally oriented square "cutting tool." A white outline is superimposed on the outer edge of the square.
Gamma-Ray Bursts Active Longer than Previously Thought
The X-ray Telescope on NASA's Swift satellite captured the intensity of a bright X-flare from GRB 060714. The elongated blue and gray regions are an artifact of the image processing (left). After the flare, (right) the GRB's X-ray emission faded considerably, revealing a faint afterglow. Click image to enlarge. Credit: NASA / Swift / XRT Science Team.
New Method to Directly Probe the Quantum Collisions of Individual Atoms
Credit: James Collins Kurt Gibble pictured with an atomic clock.
Analysis of Rhesus Monkey Genome Uncovers Differences with Humans, Chimps
Credit: Gopinath Sricandane For image reprints, contact the photographer at: gopi@photoessays.net
Scientists Discover Structure of Gateways to Gene Control
This artist's illustration shows a portion of the genome. A long DNA molecule (red cord) is wrapped up into nucleosome structures with a histone-protein core (white spheres). The gateway to gene transcription spans the control switch (coils) on the left nucleosome to the beginning of the gene (green arrow) on the right nucleosome." Credit: Christina Ullman
Gamma-Ray Birth Cries Suggest Massive Magnetic Engines
The core of a massive star in a distant galaxy collapses, ending its life — though there is little effect visible at the surface. Deep inside, twin beams of matter and energy begin to blast their way outward. (Image Credit: NASA/Swift/Sonoma State University/A. Simonnet)
Discovery Reveals that Distant Quasars Live in Massive Dark-Matter Halos
The illustration shows the distribution of dark matter, massive halos, and luminous quasars in a simulation of the early universe, shown 1.6 billion years after the Big Bang. Credit: Paul Bode and Yue Shen, Princeton University
High-Quality Helium Crystals Show Supersolid Behavior
New Protein Super-Family Discovered with Functions Critical for Animal Life
The DANGER family member, DANGER1A, is expressed in a variety of cells (brown color) which lose their ability to divide including nerves, muscle, and neuroendocrine cells. DANGER1A is first expressed in the developing mouse (embryonic stage 13.5) in the spinal cord (arrows), with increasing expression in post-natal day 0 mice, and is maximal in the adult mouse brain. Credit: D. Neil Watkins (Sidney Kimmel Cancer Institute, Johns Hopkins University)
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