When a train on which I was travelling recently (yes, it was moving, and on time, and I could afford a ticket (that's what's called a miracle!)) entered a tunnel my ears "popped" like they do on aeroplanes. Why does this happen?
Dave, I think that in future there will be a mass market for "Dave Ansell Science Cartoons", which critics will describe as "unique in their hastily scribbled yet colourful and effective mechanism of communcation"!
I know that there are various "types" of satellite such as geostationary (geosynchronous), spy satellites, communications satellites, weather satellites etc. But how far out in space are they? Are some orbiting closer than others, and do their orbits eventually decay such that they will all fall back to Earth, or will they eventually wander off into space?
What is the temperature inside the average cloud? Are the water droplets that form clouds actually frozen or ice crystals? When it "rains", does the rain start off as snow or hail, and then turn into rain on the way down, if the air temperature is high enough?
Here's a review article on alcohol toxicity and effects of ingestion.
Interestingly, isopropyl alcohol (isopropanol) has a much higher potency than ethanol (alcohol) and causes significant CNS depressant effects. A significant proportion is excreted unchanged by the kidneys, but much if it is metabolised by the liver to acetone, a ketone.
I've seen a lot of older people, especially men, with very large ears and noses. It seems unlikely that they were born with such impressive appendages, suggesting that noses and ears continue to grow throughout life.
Is this the case, and given the high prevalence amongst men, is it something to do with testosterone or some other male hormone?
Can someone please tell me about thalidomide. I overheard someone talking about it the other day, and vaguely remember it causing serious problems in the past, but just wondered if anyone could enlighten me please?
In paper the fibrils are short and arranged in various orientations, cross-linking each other like a net. We had to tease apart paper and look at it down a microscope when I was a school. Apparently the newspaper The Sun gives the best fibres for looking at down the microscope. I suppose it's got to be good for something since, as newspapers go, it's crap.