Why does something cost $19.99 instead of $20?

It's one cent.

We all know it's basically twenty dollars. The retailer knows we know it's basically twenty dollars. We know they know we know.

And yet... $19.99 survives.

In this episode of Wait... Why Do We Do That?, we investigate one of retail's most persistent little tricks: charm pricing.

We'll discover why our brains can treat $2.99 differently from $3.00, how the first digit of a price can influence the way we perceive it, and why that seemingly insignificant penny may actually affect what we buy.

We'll also investigate the wonderfully convenient story that 99-cent pricing was invented to stop dishonest shop assistants pocketing the money, why the real history isn't quite that simple, and how prices ending in nine became associated with bargains and discounts.

Then there are sale prices, luxury pricing, online shopping and the subscription economy, where $9.99 a month sounds

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Why do hotels kick you out at 11 AM? And if you can't check in until 3 or 4 in the afternoon... what exactly happened to the other five hours?

In this episode of Wait... Why Do We Do That?, we investigate one of those travel rules almost everyone accepts without really questioning.

You pay for a night in a hotel. You arrive in the afternoon. You sleep there. And then, at precisely 11 AM the next morning, your status seems to change from "valued guest" to "person housekeeping would quite like to leave."

So why eleven?

We'll look at what actually happens between checkout and check-in, why hotels need everyone leaving within roughly the same window, how housekeeping turns hundreds of rooms in just a few hours, and why simply renting every room for 24 hours would create absolute chaos.

We'll also investigate early check-in, late checkout, hotel overbooking, the surprisingly complicated illusion that nobody has ever occupied your room before you... and why it's probably best not to think too hard about the TV remote.

And then there's the real answer hiding underneath all of it.

Hotels don't really sell rooms.

They sell blocks of time.

Which finally explains those mysterious missing five hours.

Mostly.

So the next time you're standing in Room 417 at 10:54, desperately searching for the charger you were absolutely

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Why do we change the clocks twice a year? Are we actually saving daylight? And whose idea was this anyway?

In this episode of Wait... Why Do We Do That?, we uncover the surprisingly complicated history behind daylight saving time.

We'll find out why Benjamin Franklin didn't actually invent it, why farmers weren't responsible for it, and how a British builder riding his horse one summer morning decided humanity had a serious problem: everyone was sleeping while the sun was shining.

Then came World War One, energy conservation, a wonderfully chaotic period when American cities couldn't agree what time it was, and even an experiment with year-round daylight saving time that didn't quite go according to plan.

We'll also look at whether changing the clocks really saves energy, why businesses love evening sunshine, what sleep researchers think about the whole thing, and why agreeing that we should stop changing the clocks turns out to be much easier than agreeing which time we should keep.

And through it all, one appliance remains completely unmoved by more than a century of debate...

the microwave.

Because we aren't actually changing daylight.

We're just changing the numbers on our clocks and hoping our bodies, our schedules and apparently our kitchen appliances eventually catch up.

Because apparently, there's a reason for almost everything.

Even if it isn't a particularly good one.

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