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It allows you to see more clearly when the rate of growth is speeding up or slowing down. It can however also be misleading if people don't understand what a logarithmic graph is, and underestimate the number of people affected.
Talking about possibly weird graphs, it's difficult to beat this one (look at the y axis):
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Thanks @danstuff. @SwissChap it has definitely misled me at first glance. I can see the value in it, but it would be good to see a 'true' comparison shown also for context.
For the data heads: why have the government used a logarithmic scale on the global deaths graph they have shown in the last couple of briefings?