Intermediate Word:  sabot  (a) swab used to clean out a cannon  (b) wooden shoe  (c) disk used in musket to propel mini-ball  (d) wooden stirrer in butter churn
Difficult Word: - phylactery  (a) infirmary  (b) pair of Hebrew amulets  (c) master classification guide  (d) jewelry box

Breakthrough Mine-Detection Turns Ocean Floor "Transparent" - SpaceDaily  Unlike current mine-detection techniques, the patented methodology finds objects buried in the ocean floor without the use of complex, unreliable modeling and without the usual arrays of sonar transmitters and receivers. Instead, the method records the return echo of a sonar transceiver's "ping," then time-reverses and transmits that signal. The following echo clearly shows buried objects, and suppresses the response from the seafloor itself, making the underwater terrain "transparent." "Using time reversal on the return echoes back scattered by buried mines gave us results we considered amazing."
Baby Star With Dust Disk Found 33 Light Years Away - SpaceDaily  Left:  The dust disk surrounding the red dwarf star AU Mic, seen in optical scattered light. The central dark region is produced by an occulting spot suspended by four wires, masking the star. The dust disk observed near the boundary with the black mask approximately corresponds to the Kuiper Belt of asteroids in our solar system. Credit: Paul Kalas/UC Berkeley, courtesy of Science Magazine  "Circumstellar disks are signposts for planet formation, and this is the nearest and youngest star where we directly observe light reflected from the dust produced by extrasolar comets and asteroids. The young M-type star, AU Microscopium (AU Mic), is about half the mass of the sun but only about 12 million years old,

Q&A: What can Mars rovers expect?  - BBC   "When we look down from orbit with cameras and spectrometers we see tantalising clues that it used to be different. We see dried up river beds, we see dried up lake beds, we see the kinds of minerals that one might find in a hot-spring environment. We're trying to go to two places where we think it might have been warmer and wetter and more Earth-like in the past."
And to look if there is still life there?
No. We're not actually looking specifically for life. What we are doing is looking for evidence that life could have been supported. This is not a life search or life detection mission.

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