Naked Scientists Podcast

Naked Scientists episode

Wed, 31st Jul 2013

Do Hairs Know They've Been Cut?

Hair Cut (c) Kevin Jaako

A special question and answer edition of the show where the team get to grips with your queries, including, do hairs know they've cut? Is someone who sweats sooner fitter? How do noise-cancelling headphones work? How do we know what's inside Earth? Why are there no whale-sized insects? Does protein suppress appetite? And could there be a planet with a green atmosphere?

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In this edition of Naked Scientists

Full Transcript

  • 01:13 - Do hairs know they've been cut?

    Hello, I have a question about body hair. When we remove unwanted body hair by plucking/shaving, we know that they grow back more or less to its natural length. When we trim them, the hair also seem to grow back to its natural length, but this has mystified me for some ...

  • 03:50 - How does melting ice affect the volume of a drink?

    If you leave a drink with ice in it out in the sun will the volume of liquid go up, down or remain the same?

  • 06:14 - Is someone who starts sweating sooner fitter

    Who is more fit: the person who starts sweating as soon as they begin to exercise, or the person who barely breaks a sweat? The former may be thermo-regulating better than the latter, but the latter would seem to be unaffected by the exercise? Jon

  • 09:05 - Does dietary protein suppress appetite?

    I was saddened to hear the news earlier that the comedian, Mel Smith, has died of a heart attack aged just 60. I was also a little concerned at his passing as I am reckoned to be one of those in the high-risk category. I watched an interesting documentary in the Horizon series...

  • 17:57 - Why are so many daddy longlegs around?

    With hundreds of daddy longlegs filling the air in Cambridge we wanted to find out why there are so many around

  • 24:06 - Could nuclear waste be disposed of in subduction zones?

    I have wondered if the geological, tectonic subduction of nuclear waste materials might be a practical way to permanently remove these dangerous substances from the earth's surface and at the same time to feed the Earth's magnetic field. Is anyone working on the development of su...

  • 27:56 - Why are there no whale-sized insects?

    Really enjoy your programme. Why don't we see insects as large as whales or cows ? Why is the ratio of largest to smallest so much bigger for mammals (blue whale vs kitti's hog nosed bat) than it is for insects (goliath beetle vs fairy fly) ? Thanks, Jim Schaefer Ann Ar...

  • 31:46 - Are Pandora viruses a fourth domain of life?

    Scientists have recently discovered the Pandora viruses. It was said they could possibly suggest a fourth domain of life. I was wondering what the implications of these viruses could be and how could we use them?

  • 35:50 - How do we know the Earth's core is solid?

    I read somewhere that it was discovered that the inner core of the earth was solid because shear waves had passed through it and they can't pass through a liquid. Since the inner core is solid and the outer core is liquid, how did the shear waves pass through the outer liquid...

  • 37:45 - Why are we sensitive to red green and blue?

    We're told that the rods and cones in ones retina are sensitive to red, green and blue. Why not red, yellow and blue the three primary colours? It seems more logical to me.

  • 46:06 - Could a planet have a green atmosphere?

    I am a physics and astronomy lecturer at the University of New Mexico and students in my introductory astronomy class have the following question. Could a planet have a green atmosphere and if so, what gases would it consist of? I am a longtime listener and download your podca...

  • 47:27 - How do noise cancelling headphones work?

    Noise cancelling headphones - if energy can't be destroyed are we hearing the same pressure of noise silently?



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