WEBVTT
Kind: captions
Language: en

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This is Spain, and over there, just over the
Guadiana River, is Portugal.

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Here, it is about 4pm, and over there, it
is about 3pm.

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Because time zones.

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Now, thanks to the Schengen Agreement, I can
travel between 29 European countries without

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any border guards or passport checks.

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And thanks to an enterprising British ex-pat,

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I can choose to travel between
these two European countries

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by zip wire.

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Now, if there's one thing I've learned while
programming computers,

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it's that there are always edge cases.

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You can try to plan for everything,

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but the real world is always fuzzier than
you might think.

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Names, addresses,
personal details, geography, maps,

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you can try to put the world into a database

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but the world will always provide you with
exception to every rule.

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And this here is a brilliant way to demonstrate it.

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So I'm going to put a few things on screen
during my ride.

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The current time.

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The time I set off.

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The cost of the zip line ride.

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And, using some deliberately shoddy code,
the time elapsed.

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So the next time you write some code for the
world to use:

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have a think about the edge cases.

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-- Right, okay!
-- Thank you!

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-- Legs up!
-- Legs up!

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Woo-hahahaha! Yes, boy! Woo!

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There we go!

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-- That was good.
-- Perfect.

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-- Got it. On there? Got it.
-- Okay.

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Muy bien.