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All organophosphate chemicals act the same way, but weapons-grade chemicals are several thousand times more potentHow do chemical weapons affect the human body?

How do 'nerve gases' like sarin affect the human body? How do you know if someone has been exposed to them?

Thousands of point elevation measurements from the laser altimeter onboard the Mars Global Surveyor spacecraft were processed to create this computer-generated view of the largest volcano yet known in our solar system, the 22-kilometre-high Olympus MonsHow do you measure height on Mars?

We use sea level to measure height on Earth. What is used on Mars? (or other planets for that matter) [an error occurred while processing this directive] comments

AOD 9604 - also known as Lipotropin - is at the centre of a drug doping controversy in Australian footballWhat is the drug AOD-9604?

What does the drug AOD-9604, which has been used by some Australian football players, actually do?

High voltage: The current in a lightning bolt can produce tens of thousands of amps and exceed 100,000 voltsShould I turn my computer off during a lightning storm?

Should I turn my desktop computer off during a lightning storm or is it okay to leave it on standby? Do surge protectors always work? [an error occurred while processing this directive] comments

Voyager 1 is now 121.7 astronomical units away from the Sun Where does the solar system end?

Where does the solar system end, and has Voyager 1 crossed the edge yet? [an error occurred while processing this directive] comments

Cold fronts often bring stormy weather.What's with the cold fronts, Australia?

Why doesn't Australia get the same weather fronts as the northern hermisphere? Why do we see only cold fronts? [an error occurred while processing this directive] comments

Dragonflies have two sets of wings that can be used together or independently.What are dragonfly wings made of?

Why do dragonfly wings look glassy? What are they made of? [an error occurred while processing this directive] comments

Black Holes distort space-time preventing even light from escaping its gravitational pull once a photon passes beyond the event horizon.Is the speed of light constant throughout the universe?

Is the speed of light constant throughout the universe? Has it changed over time? And what happens when it reaches a black hole? [an error occurred while processing this directive] comments

Coal takes longer to form than any other rock typeIs coal still being formed today?

Is the process that is at the origin of coal still existent, why or why not, and where does proof of it exist? [an error occurred while processing this directive] comments

High pressure systems are often associated with hot weather in summer, but in winter they can bring cooler weather.How do high and low weather systems work?

If hot air rises why does it form 'highs' while cold air forms 'lows'? How do high and low weather systems work? [an error occurred while processing this directive] comments

Earlier this month, scientists released the first images of a giant squid swimming in deep water off the coast of Japan. The elusive cephalopod, which can grow up to 14 metres long, is one of the biggest invertebrates in the ocean. Are there any freshwater cephalopods?

Do freshwater cephalopods exist, and if not, what is the most likely reason why not? [an error occurred while processing this directive] commentsArticle has photo slideshow

Real dinosaurs lived in a world that would have been different to ours in more than the obvious waysHow many hours were in a dinosaur's day?

I heard a scientist say that a day was 21 hours long during the time of the dinosaurs. Is this true and if so why? [an error occurred while processing this directive] comments

Gravitational pull, and therefore weight, is lower on a mountain than at sea level. But your mass does not change.Does your weight change as you move above or below Earth's surface?

Does a person get lighter the higher above the Earth they move? If so, do they get heavier the closer to the centre of the Earth they move? [an error occurred while processing this directive] comments

People watch a total eclipse over Australia from Lyndhurst in South Australia in 2002How often do solar eclipses occur?

How often do different types of solar eclipses occur and why? Why don't you see one every time there's a new moon? [an error occurred while processing this directive] comments

Cancer spreading from one individual to another via blood is "very unlikely"Can cancer cells spread from one person to another?

Can tumour cells get passed to another person through blood contact, for example from blood donations or used needles? [an error occurred while processing this directive] comments

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