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'LIFE-CHANGING'

Mind-blowing facts people have only just discovered including secret iPhone mic and reason behind holes in pen lids

THESE are the mind-blowing facts people have only just discovered, including the secret mic on an iPhone and the reason pen lids have holes in them.

Using the hashtag #TodayYearsOld social media users have been sharing their innocent revelations as they find out the true reason for everyday items.

The reason pen lids have holes in them is to children can still breathe if they choke on one
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The reason pen lids have holes in them is to children can still breathe if they choke on oneCredit: Rex Features
It turns out iPhones have a secret mic on the back so it can record the audio of a video properly
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It turns out iPhones have a secret mic on the back so it can record the audio of a video properlyCredit: Alamy

There are some hilariously obvious examples, such as the simple explanation for the division sign in maths.

But not all of them could be guessed so easily.

Do you know the real reason there are holes in the top of a pen lid?

Or the real reason bobble hats have a bobble?

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Here's a clue, they're not just for cosmetic reasons.

Two radio hosts in Australia caught onto the trend and asked listeners to call in with their #TodayYearsOld realisations.

Jonesy and Amanda of WEFM 101.7 held an on-air debate about the life-changing discoveries people have made and some of them were hilarious.

Most of you probably know this, but the reason it's called a shepherd's pie is because it's made with lamb
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Most of you probably know this, but the reason it's called a shepherd's pie is because it's made with lambCredit: Getty - Contributor
Some cars have a little arrow on the fuel gauge to show which side the fuel cap is on
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Some cars have a little arrow on the fuel gauge to show which side the fuel cap is onCredit: Rex Features
The real reason bobble hats have a bobble isn't to look good, it was to protect sailors and soldiers from hitting their heads
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The real reason bobble hats have a bobble isn't to look good, it was to protect sailors and soldiers from hitting their headsCredit: Getty - Contributor
In another iPhone revelation, this techphobe only just realised the flash could be turned on as a torch without an app
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In another iPhone revelation, this techphobe only just realised the flash could be turned on as a torch without an app
The best way to release ketchup from a glass bottle is to tap the '57' sticker
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The best way to release ketchup from a glass bottle is to tap the '57' stickerCredit: News Group Newspapers Ltd
Supposedly, the hole in a pasta ladle is a guide to help you prepare the perfect portion size
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Supposedly, the hole in a pasta ladle is a guide to help you prepare the perfect portion sizeCredit: Imgur
One man discovered there's a cardboard tab on either end on cling film and tin foil packages to hold the rolls in place
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One man discovered there's a cardboard tab on either end on cling film and tin foil packages to hold the rolls in placeCredit: Imgur
This tweeter is complaining they were never taught the very simple reason a division symbol looks the way it does
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This tweeter is complaining they were never taught the very simple reason a division symbol looks the way it does
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