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What is the definition of a heat wave according to the World Meteorological Organisation?
When the maximum temperature is at least 5 degrees Celcius hotter than average for five consecutive days.
Submitted by Eugene Mwansa
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Mongolia has the lowest population density in the world. Which country is second?
Namibia - 2.6 people per square kilometre
Submitted by Günter Hohls
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What do the names Bismark, Pierre and Helena have in common?
They are the names of US state capitals - North Dakota, South Dakota and Montana, respectively
Submitted by Roy Galanis
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Congratulations to today's winner, Clive O'Connell!