Why do we like Christmas music so much?

Last Christmas, I gave you my heart, but the very next day you gave it away.

This year, to save me from tears, I'll give it to someone special...

And so on, and so on. I'm sure, you do know the lyrics. Almost everyone do. One of the main reasons, why do we know Christmas songs so well, is that every year they repeat so many times that you unconsciously learn both, the melody and the lyrics. Even if you don't like all those super happy Christmas songs when you first heard it, it's more than probable that after a few years you will start first humming it, then singing it and finally loving it. It's because of the so called 'exposure effect'. The scientists claim that the more often we hear a particular song, the more we like it. So if you still don't like Christmas music, just keep listening to it!

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Why do we yawn?

Let's say it clear, there are two main reasons why do we yawn: we usually yawn when we are bored or when we are tired. When you have to read another essay that makes you almost fall asleep, but you force yourself to finish it so you keep reading, and reading... I'm sure that at some point you start yawning. Or after a long day at work, when you have no more energy to call a pizza delivery place so you just sit on a couch doing nothing... You yawn a few times or more. But when we see someone yawning, we yawn too. Actually, sometimes thinking about it, forces us to do it, even if we are not neither bored nor tired. So why do we yawn then? And, is yawning contagious? Well, it definitely is and I'm sure you already know about it. But do you know why? It's a one of the common forms of echophenomena which is an automatic imitation of somebody's actions. So, are you already yawning?

Why does bread usually fall buttered side down?

This morning, when I was preparing my breakfast, it happened again: my sandwich fell to the floor, buttered side down. Maybe it's just a coincidence, or I have a permanent bad luck, but it happens to me every single time when I accidentally drop my sandwich. In fact, there is a scientific explanation, why does bread usually fall buttered side down. There's even a site on Wikipedia dedicated to Buttered toast phenomenon . Let's just say, without mentioning unnecessary law of physics, that when you hold a toast or when you put it on the kitchen table, it is at the perfect level to rotate and land the buttered side on the floor. If you want to avoid it, there are some rules you can follow. You can cut the bread into smaller slices, or you can try to elevate the surface that you are working on , which will probably change the number of rotations and hopefully make the bread land on the desirable side. The shape of the slice is also important- if you make it a...

Why is mathematics so hard?

Maths was never my favourite subject at school. I had some problems with it, especially when it comes to the exercises that begin with Prove that... But generally, if I put enough effort into it, I was able to solve them. However, some friends of mine couldn't make it. Some of them complained that it is not their fault that they have bad results. Maths is simply too hard to understand. Why many people find it so difficult? There are many reasons, but first of all: in mathematics you have to find the exact answer. One mistake and the result won't be correct. A plus sign instead of a minus, four instead of three and you're wrong. It is quite demotivating for everyone. You have to practise a lot, if you want to get comfortable with the type of exercise. You need to understand the basics if you want to deal with some more advanced maths equations. So, don't get discouraged and keep practising!

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