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  • Red squirrels and a tropical Antarctica | Podcasts - The Naked Scientists
    Red squirrels used to be the most common squirrel in Britain But since the grey squirrel was introduced from the USA as an illegal immigrant in the late 1800s, their numbers have nose-dived It's not just competition for food; grey squirrels brought a deadly virus with them which has hit red squirrel populations hard Sue Nelson goes to one of the last red squirrel strongholds in the country
  • Does a red sky at night really mean nice weather ahead?
    So it was a sign of bad weather And red sky in the evening, you know, was the reverse, and it meant that the sun setting in the west was shining on the clouds going away to the east, and therefore the bad weather was going away So weather proverbs are not without value They've been honed over the years
  • Why does red meat turn white with cooking? | Science Questions
    Red meat contains an iron-rich chemical called "myoglobin" which also changes its shape when it cooks and changes colour from red when it's raw to sort of brownish grey when it's fully cooked If you're cooking red meat, sometimes you get a lovely brown colour on the outside and that really tasty meat smell that always makes you hungry
  • Why do you go red when sunburnt? | Science Questions - The Naked Scientists
    Chris - Would anti-inflammatories, like aspirin, make you feel better if you've got sunburn? Kat - They'll help to relive the pain, and they may help to take the inflammation down, but of course the most sensible thing is don't get sunburnt in the first place
  • Why is gooseberry jam red when gooseberries are green?
    Sarka - This question also really intrigued me My mother often makes jam from green gooseberries and the colour is never red but rather dark yellow or light orange It's a colour change either way Charis - We also had a mixed response on Facebook Jodi Knight thinks it's just the difference in the colour of gooseberry used
  • Could red shift just be the colour of the star?
    Dominic - Stars certainly do come in wide variety of colours Hotter stars will tend to be bluer than cooler stars like Betelgeuse which are comparatively red But when you're looking for the red shift, looking at the frequency shift which is associated with the velocity of that star, what you're looking at are spectral lines
  • What causes Red Eye in Photographs? | Science Questions
    Red eye occurs because when you take a flash photograph - the camera produces a big burst of light to illuminate the subject and that burst of light goes in through the open pupil of the subject, and bounces off the back of the eye
  • Can bulls see red? | Science Questions - The Naked Scientists
    They see the world like a red-green colour deficient person So waving a red rag at a bull isn't a problem because it's red, but because it's moving They're responding to the movement rather than the red, although they can still see the colour They will just get confused between red and green rags
  • How large (or small) is a photon? - The Naked Scientists
    This wave-like nature gives us one way to talk about the “size” of a photon: its wavelength Red light has a wavelength of about 700 nanometres (roughly the size of a virus), while X-rays can have wavelengths a thousand times smaller Radio waves, which are still made of photons, can be metres or even kilometres long
  • Why is blood red? | Science Questions - The Naked Scientists
    The reason blood is red is because it's got iron in it If you look down a microscope at blood, what you'll see are thousands of tiny little red cells that are referred to as bi-concave discs If you look at them from the side, they look like a number eight and that's because they've got a thick ring round the edge and a flattened centre, a bit





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