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Garlicked

Your article, “The good thing about garlic breath” (Science, 25 January, p 14) explained the human body’s reaction to eating garlic by releasing chemicals during metabolic changes. To mitigate garlic breath, one is supposed to eat fresh parsley or other herbs. How do the herbs affect those chemicals?Martina Rowley, Sunningdale, Berkshire
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  • Asked by damian
  • on 2007-10-16 18:03:28
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Categories: Domestic Science, Human Body.

Tags: human body, domestic science.

 

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Sidelined

I am right-handed and left-footed. I know someone else who is left-handed and right-footed. How does this square with theories about the evolution of sidedness?David Marshall, Hove, Sussex
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  • Asked by damian
  • on 2007-10-16 18:03:04
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Categories: Human Body.

Tags: human body.

 

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Tone deaf

If I yawn while listening to music on my headphones, the perceived pitch falls about half a semitone. The pitch can’t really be going down because it is determined by the CD and player to which the headphones are attached. So does the time slow as I yawn or is there another explanation?Richard Gledhill, London
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  • Asked by damian
  • on 2007-10-16 18:01:54
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Categories: Human Body.

Tags: human body.

 

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Red handed

When I was lying in bed this morning the sun was shining annoyingly into my eyes through the window. I raised my hand, palm directed towards the sun to cut out the light. After a few moments I saw that my fingers were outlined by bright red light. By strategically placing folds of sheets around my hand and head to create a shady zone, I could make the effect even clearer. Then I noticed that by angling my palm (by rotating, not bending, my wrist) I could change the strong red outlines to very faint blue ones. What was going on?William McGregor, Varese, Italy
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  • Asked by damian
  • on 2007-10-16 17:58:30
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Categories: Human Body.

Tags: human body.

 

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Blood lines

Routine transfusion of blood is usually traced to Landsteiner’s discovery of the A, B and O blood group system early in the last century. But, according to the Encyclopaedia Britannica “The Incas apparently practised blood transfusion successfully much earlier – nearly all South American Indians are of blood type O rhesus positive, and incompatibility reactions must have been few.” I have not been able to find any other references to this practice. How extensive was it, was it ritual or remedial and how was the blood channelled unclotted from donor to recipient?Örnólfur Thorlacius, Reykjavik, Iceland
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  • Asked by damian
  • on 2007-10-16 17:58:11
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Categories: Human Body.

Tags: human body.

 

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Calm before the cold

The only time I ever notice that I feel particularly well is always the day before I go down with a nasty cold. Why?Ian Henkin, Leeds, West Yorkshire
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  • Asked by damian
  • on 2007-10-16 17:57:35
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Categories: Human Body.

Tags: human body.

 

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New Life

How good is the human body as a fertiliser? If I was buried under a young apple tree would it receive sufficient nitrogen, phosphorus and potassium to grow and mature? What other breakdown products – from my body’s fats, proteins and other substances – would help to sustain the soil micro-organisms?tbc
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  • Asked by damian
  • on 2007-10-16 17:57:25
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Categories: Human Body.

Tags: human body.

 

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Growth spurts

In my youth I had plenty of hair atop my head but very little sprouting from my ears and nose. Sadly, the reverse is now true. I know that I’m not alone among men in this respect, so there must be some reason why this happens to so many of us. Why is it?Alan Hermann, Radlett, Hertfordshire
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  • Asked by damian
  • on 2007-10-16 17:27:34
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Categories: Human Body.

Tags: human body.

 

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Kiss and tell

Kissing is a very enjoyable aspect of human sexual activity. Is it universal among human cultures? Does it occur in other species?Pete Fowler, Southland, New Zealand
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  • Asked by damian
  • on 2007-10-16 17:26:59
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Categories: Human Body, Animals, Plants, Unanswered.

Tags: human body, animals, unanswered, plants.

 

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Ear for music

I am friends with two couples, all equally keen birdwatchers. Both women can distinguish between different birdsongs but, although both like music, can’t tell one symphony from another. The two men have excellent memories for music but both have great difficulty in distinguishing birdsong. Are two different kinds of memory required, or are the sounds processed by different parts of the brain?Anne Gerrish, Ely, Cambridgeshire
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  • Asked by damian
  • on 2007-10-16 17:26:21
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Categories: Human Body.

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