Understanding Ice

Ice is just frozen water, right?

Wrong!

Now you will perhaps inquire with astonishment how it is possible that ice, which is the most brittle and fragile of substances, can flow in the glacier like a viscous mass; and you may perhaps be disposed to regard this as one of the wildest and most improbable statements that have ever been made by philosophers.
Hermann von Helmholtz, 1865

It's very difficult to make absolutely pure ice, even in the lab.  Most especially in natural conditions, when ice forms it includes all sorts of chemicals and particles - and they affect its properties significantly, as does the water itself and the bottom topography.

Ever wonder what the future of space tourism will be? This series of posters (from the same collection as last week's spaceport illo) in neo-retro style clearly presents your options.

You are all familiar with a solar eclipse, when our Moon passes in front of the Sun and blocks its light, but a similar situation can happen with asteroids, those Sun-orbiting, rocky objects left over from the formation of the Solar System or formed by collisions between other asteroids.

We know of about 400,000 asteroids, which range in size from a few hundred kilometers to just a few meters.   Obviously an asteroid is too small to cover the Sun but because of proximity one will occasionally move directly in front of one of the stars in the night sky and block its light from our view, causing a stellar eclipse or 'occultation'.

Homeopathy's origin should be a clue to why there is no evidence to show it has ever worked.  In the words of Samuel Hahnemann, the German physician at a time when being an M.D. was not a mark of respect, believed

"The vital force that animates the healthy body, rules with unbounded sway, and retains all the parts of the organism in admirable, harmonious, vital operation . . . so that our indwelling, reason-gifted mind can freely employ this living, healthy instrument for the higher purpose of our existence."

...

"when a person falls ill, it is only this spiritual vital force, everywhere present in his organism, that is primarily deranged by another dynamic influence hostile to his life." 

Nature is never inexplicable