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From what I understand the earth revolves around the sun and the sun revolves around a black hole in the middle of the galaxy. In turn, apparently the black hole in the centre of the galaxy is also...
I've inherited a number of dried sea animals such as a starfish, sea-horse and a number of unusual shells. One of them is baffling me as far as identification is concerned and I wonder if anyone could...
All things being equal (which they never are), the volume of a body goes up in proportion to the cube of a linear dimension. The volume of a sphere of radius 2r will be 8 times the volume of a sphere...
Not a question, but something for anyone who's interested.
http://www.sciencemag.org/news/2016/02/gravitational-waves-einstein-s-ripples-spacetime-spotted-first-time...
I just heard on the news that life expectancy in England has risen to its highest level ever. The newsreader said that a man now aged 65 could now expect to live to 84. What does this mean? Does it...
Can it be explained in simple terms, the extent of impact of two vehicles in a head-on collision. Here's my scenario:- car A & car B are travelling in opposite directions, both are doing 50 mph (no...
Before NiMH batteries we had NiCd batteries. So I know there was nickel and cadmium involved. Why are 'they' so coy about NiMH batteries? What does the M stand for? Obviously, I know it stands for...
For years, I've used stainless steel metal scourers for cleaning burnt on deposits on non-delicate cooking trays, pans etc. The one I usually buy looks like a fist size lump of metal springs or...
taste for sugar? Its nutritiously empty, rots teeth and is blamed for a whole raft of diseases, not to mention it makes you fat. And yet humans seem to crave it in one form or another. If 'survival of...
A toy bird that looks a little like an ostrich, it continually dips its head into a beaker and then out again. Uses the phenomenon of capillary action I think to go on and on, apparently endlessly. I...
My husband would love a telescope but don't really know where to start. I bought him one previously for £100 but it was shockingly bad so was sent back..... He just wants a good decent one for a...