I took my dog to the park in the snow. She is very small and while running around in the snow, hard, icy "snowballs" formed on the fur on her chest. How and why did this happen?Alix Buttimore, (aged 11), London, UK
I recently bought a spray-on deodorant. When I got it home I realised it was intended for women but, not wanting to waste money, I used it anyway. Nothing untoward happened and I received no strange looks from colleagues or friends. So what are the differences between deodorants meant for men and those that are meant for women? How might using the "correct" deodorant for your sex work better than using one meant for the opposite sex, and what are the pitfalls of applying a deodorant intended for the opposite sex?Alan Ainscroft, Leeds, West Yorkshire, UK
While camping in the desert north of Coober Pedy, South Australia, on 8 July 2007, my son and I were privileged to witness a white rainbow at daybreak (see Photo, left). The landscape was covered in mist and the white rainbow's arc seemed to grow as the sun came up, though it faded away as the mist evaporated. I've asked old swagmen, indigenous locals and several lecturers at two universities, but none has ever witnessed the phenomenon. What caused it?Fred Richardson, Alice Springs, Northern Territory, Australia
During the Monaco Grand Prix, I was watching the drivers battle with the damp conditions when the commentator said that rain was expected at the track in 6 minutes. How can forecasting be so accurate? If such technology is available, why isn't it offered to the public? Incidentally, the rain didn't arrive on this occasion, but was predicted with such confidence that presumably the forecasting must be accurate most of the time.Derek Bolon, Tetbury, Gloucestershire, UK
I have just read the label on my shampoo bottle. The list of ingredients is mind-boggling. How on earth did anyone come up with such a complex concoction and what exactly are chemicals such as sodium diethylene-triamine pentamethylene phosphonate and hydroxyisohexyl 3-cyclohexene carboxaldehyde doing to my hair?
I left my saw hanging up in my damp shed. Much later, I found it was covered in these seemingly random lines of rust (see Photo, left). Why did they form like that?Bill Adsett, Bristol, UK
Walking along the breakwater at Berwick-upon-Tweed in north-east England recently, my granddaughter and her mother noticed their hair was standing on end (see photo, above left). It started to rain soon afterwards, but there was no thunder or lightning that day. What was happening?Richard Turner, Harrogate, North Yorkshire, UK
I saw what looked like a huge tube of cloud floating just below a uniform blanket above rural Oxfordshire, UK, at 7.30 am on 11 December 2007 (see Photo). Anyone know why it formed?Shuvra Mahmud, UK
Upon leaving the house early one frosty morning, I noticed the emblem on my car was frosted over on all the letters but one. The N was completely frost-free (see Photo). The outside temperature was hovering around 0 °C. If all the letters were constructed of the same material, surely they would all appear the same, so why is the N special?Nikki Cherry, Peterborough, Cambridgeshire, UK
I took this photo (left) of an impressive icicle that was hanging from a roof. It had formed over a couple of days in sub-zero but sunny conditions as melting snow running from the roof froze as it trickled down the icicle. What caused the horizontal ripples, and what properties of the water and air determined the precise wavelength of the ripples?Hugh Hunt, Cambridge, UK