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Wednesday, 14 March 2012

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Why are rising CO2 levels caused by burning fossil fuels?

How fast are carbon dioxide levels in the atmosphere rising? How can you tell that rising carbon dioxide levels are caused by burning fossil fuels and not natural causes such as bushfires, volcanoes, rising ocean or soil temperatures?

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Patchy clouds can intensify UV levels because radiation is reflected off the clouds' edge.

Do I need sunscreen on a day with extreme UV levels if it's cloudy?

Tuesday, 24 January 2012 7 comments
It's been pretty overcast lately but I noticed that the UV index rating on the daily weather forecast is extreme. Wouldn't clouds make the UV index lower?

Life without gravity can be a real painWhy don't we build spinning spaceships that create artificial gravity?

Tuesday, 10 January 2012 24 comments
I always thought the idea of a rotating space station would neatly get around the problem of no gravity, by artificially creating it by spin. Yet none of the current spacecraft designs include this feature. Why has this simple solution been abandoned?

Santa would need to deploy some heavy duty physics to travel the world in 24 hours!Is time travel possible? (How does Santa do it?)

Wednesday, 21 December 2011 27 comments
How does Santa manage to deliver presents to the world in just one night? Could he be using time travel?

"A box jellyfish sting is the worst imaginable pain"
Should vinegar be used on all jellyfish stings?

Tuesday, 13 December 2011 5 comments
Does vinegar work for all jellyfish stings? And how does it work?

Solar flares take only 8 minutes to reach the Earth.Could a solar flare wipe out life on Earth?

Wednesday, 23 November 2011 6 comments
I was watching a movie where a super solar flare was about to enter the Earth and destroy all living things on the planet. Could this happen?

Tick, tock: our time system came from the ancient Egyptians and Babylonians.Why are there 24 hours in a day?

Tuesday, 15 November 2011 24 comments
We divide the day into 24 hours, one hour into 60 minutes and one minute into 60 seconds. What other comparably accurate methods have been used throughout history?

Some Australian beaches are gold like the sun Why are some beaches more golden than others?

Monday, 31 October 2011 6 comments
On a recent holiday to Noosa I noticed how much more 'golden' the beach sand is compared to WA's beaches. Why is the sand so different in colour?

During a hot flush, the brain tricks you into thinking you're heating up.What causes women to have menopausal hot flushes?

Tuesday, 18 October 2011 21 comments
I know hot flushes are common for older women, but what are they caused by?

Monkeys and humans share a common ancestor If evolution is real why are there still monkeys?

Tuesday, 4 October 2011 17 comments
How can we be descended from monkeys if there are monkeys around today?

Why do some people love broccoli and others hate it?Why do some people hate the taste of broccoli?

Wednesday, 21 September 2011 14 commentsArticle has audio
I have always wondered why things taste bad to some people. For example, I like the taste of broccoli but my wife can't even swallow it.

The King's Speech tells the story of how King George VI (played by Colin Firth) used techniques devised by an Australian speech pathologist to overcome his stutter.Why don't people stutter when they can't hear themselves speaking?

Tuesday, 6 September 2011 5 commentsArticle has video
Why don't people stutter if they're listening to music while they read out loud?

The universe is expanding at an ever increasing rate but Arp-302 provides a textbook example of how gravity dominates in local space causing the two galaxies to collide, much like the Milky Way and Andromeda will in billions of years from now.How can galaxies collide if the universe is expanding?

Tuesday, 23 August 2011 14 comments
If the universe is expanding and galaxies are moving away from each other, why do astronomers say the Milky Way and Andromeda galaxies are going to collide?

Why do young people have an amazing ability to text their friends, check Facebook and browse the internet for fashion bargains, all at the same time? Have we always multi-tasked?

Wednesday, 17 August 2011 3 comments
Have new technologies like mobiles, tablets and laptops turned us into multi-tasking masters?

Planning and strategy may make women appear to be better mult-taskers.Are women better multi-taskers than men?

Thursday, 11 August 2011 3 comments
Are women better at multi-tasking than men? And does being a parent improve your ability to do more than two things at once?

The Horsehead Nebula is a swirling cloud of gas and dust about 1500 light years from Earth in the constellation Orion.How does space dust affect our view of the night sky?

Thursday, 28 July 2011 2 commentsArticle has photo slideshow
I've heard it said that without interstellar dust to obscure starlight that the night sky would be ablaze with light. Is this true?

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