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I'm professor Hans Rosling.

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I'm going to show you

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why it is that the Ebola epidemic

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is so dangerous.

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It's because one patient, on average,

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keeps infecting two other persons.

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That doesn't sound so dangerous,

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but I will show you

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what it means in reality.

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If this is the first person
infected in the country,

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that person will infect two others,

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and this one will infect two others,

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and this also.

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Each of this ones infects two others.

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That doesn't look too bad,

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but look what happens
when it continues.

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There, it's already
32 persons infected.

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If we let this continue,

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the epidemic will become dangerous
for the whole world.

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Let me show you the danger
in another way.

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Look at the blocks.

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Some diseases increase like this,

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from month to month:

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1, 2, 3, 4, 5, 6, 7.

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That's not how Ebola increases.

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If one patient infects two others,

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it doubles from month to month,

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so this is what it happens with Ebola:

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1, 2, 4, 8, 16, 32.

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And the next month,
twice as many: 64!

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So you see,

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if actions are taken this month,

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this is how much resources are needed.

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If you delay the actions
for another two months,

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you'll need
four times as much resources.

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Not to mention
if you delay it further.

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There is no alternative:

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the Ebola epidemic has to be stopped now.