Science Podcasts

Naked Scientists episode

Sun, 8th May 2011

Should I Lie Down to Tan?

Sunbathing in Naama Bay, Sharm el-Sheikh, Egypt. (c) Svetlana Makarova

Is standing or reclining best for the perfect suntan?  Can we see atoms?  Why add pennies to Big Ben's pendulum?  It's a question and answer show so we shoulder your scientific conundra!  We'll find out how web companies keep up with growing data demands, what causes white ridges on fingernails, and why a clean glass keeps cola fizzier.  Plus, in Kitchen Science, we find out how to balance a broom whilst blindfolded!

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In this edition of Naked Scientists

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  • 01:34 - Climate change has affected crop yields

    In the last 30 years, corn and wheat crops have dropped by 3.8 and 5.5 per cent in response to climate change. This decrease in production has occurred in spite of technological advances, pest control measures and the use of fertilisers...

  • 04:10 - Box Clever: jellyfish use eyes to navigate

    At just one centimetre across, the box jellyfish makes a poor contender for being a paragon of intellect. But now new research has show that these tiny creatures can actually navigate by following the outlines of objects in the sky above them.

  • 07:31 - Antihydrogen trapping

    Researchers at CERN have managed to trap anti-hydrogen atoms for longer than ever before...

  • 09:46 - The Brain's First Whiff of Nicotine

    A new study sheds more light on how the brain responds to its first ever whiff of nicotine. By looking at activity in the brain tissue of a rat as itís exposed to nicotine for the very first time, Professor Daniel McGehee, at the University of Chicago, can help to understand ho...

  • 21:33 - Is Earth's core cooling?

    I have a question.. † How has the Earth's core remained so hot for billions of years?† Is it cooling down? † Some say it is as hot as the surface of the Sun, if that is the case, why are we not all frazzled, since the core is only a few thousand miles from our feet and the Su...

  • 24:42 - Would switching a bulb on and off each second extend it's life?

    Would switching a bulb on and off each second extend it's life?

  • 39:55 - Why does cooled water sometimes suddenly freeze?

    When a common bottle of† H2O is placed into a freezer, prior to freezing,† yet cold enough, when removed from the freezer and exposed to 95 degree temp. , the H2O will actually freeze inside the plastic bottle right before your eyes.† Top to bottom.† Why and How?

  • 42:17 - Why are native African people black?

    If dark skin absorbs more heat, why aren't native African people white, and Inuit people black?

  • 47:36 - Why do fingernails have horizontal marks on them?

    Hi Chris why do my fingernails have a. Horizontal lines and b. Sometimes indentations running across them? Cheers Peter F

  • 49:31 - Is it better to suntan lying flat?

    As we head in to spring, my wife and I have had a debate concerning the efficacy of tanning while lying down, as compared to walking about. † My wife contends that lying stationary while tanning if more effective than walking about without one's shirt on. †I have contended tha...

 

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I heard this on the podcast and I'm thinking standing up would be ideal, in fact the tanning industry thinks so too. The new higher end tanning options at tanning salons/parlors are now walk in (not unlike the spray tan booths) as opposed to lay in units... however you aren't getting bombarded by the sun from all angles outside, I'd still imagine you'd get your sides better, and likely a more even tan assuming a clear line of sight to the sun assuming it's not directly over head and that you aren't standing facing the same direction the entire time (obviously) ryanmercer, Thu, 26th May 2011

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