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...Economic growth is supposed to work the same way – increased wealth this year allows us to spend and invest to produce more wealth next year, with this continuing year after year. Of course, the sound from the loudspeaker cannot get louder and louder forever, populations of organisms don’t actually go on expanding forever, and whatever economists may say, economic...

...economic running and swimming are difficult to combine in the same animal...Studying mammals: Return to the water: 2.4 Staying warm … - In this section, you will meet the term 'thermal conductivity' and you will be asked to accept that it is 'a measure of how readily heat flows from a particular material'. You may be uncomfortable about the lack of detailed explanation...

...economic factors, with richer and/or more densely populated areas being better represented. Population density also reflects geography; deserts and high mountains are usually sparsely inhabited. Why is there a relative imbalance in coverage between the Northern and Southern Hemispheres? The Southern Hemisphere is under-represented in terms of coverage, because compared...