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Aurora
The End wasn't The End - Found a new home after the great exodus of 2012

i was not expecting to learn a bit of science then i looked at the comments of a pony farting in a jar.  
my day has just been full of weird.
DanielTepesKraus
Greatest Poster in the Board -
GREEN - TALK TO ME
Nightmare in the Moon - Had their OC in the 2024 Derpibooru Collab.
Roseluck - Had their OC in the 2023 Derpibooru Collab.
Elements of Harmony - Had an OC in the 2022 Community Collab
Twinkling Balloon - Took part in the 2021 community collab.
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends

will return
In 1771, Joseph Priestley put a mouse in a jar with a candle. He noted that the mouse would pass out at the same time the candle extinguished. Next he put a mouse in a jar with a candle and a piece of mint, and noted that the mouse stayed conscious and the candle remained lit. This was the first time in history that someone demonstrated that oxygen was necessary for animals and fire, and that plants provided oxygen.
 
This means nothing within the context of the picture, I just wanted to share some scientific history with y’all.
Cirrus Light
Economist -
Condensed Milk - State-Approved Compensation
Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.
Helpful Owl - Drew someone's OC for the 2018 Community Collab
Birthday Cake - Celebrated MLP's 7th birthday
Best Artist - Providing quality, Derpibooru-exclusive artwork
Magical Inkwell - Wrote MLP fanfiction consisting of at least around 1.5k words, and has a verified link to the platform of their choice
Not a Llama - Happy April Fools Day!
Friendship, Art, and Magic (2017) - Celebrated Derpibooru's five year anniversary with friends.
An Artist Who Rocks - 100+ images under his artist tag

Sciencepone of Science!
@PwnyPony
 
@BK_Leonidas
 
Actually, you don’t use up air. Your lungs absorb oxygen (Earth’s atmospheric air is ~80% Nitrogen, and 20% Oxygen) and combine Oxygen O2 molecules with Carbon to form Co2, and at that, only a small fraction of the oxygen (which is only 20% of the air) you consume with each breath is actually used.
 
Also, Co2 is somewhat toxic. In a trapped airtight container, you will die from breathing in too much Co2 long, long, long before you run out of oxygen.
 
And with a container that big compared to her lungs, it might take her all day to build up too much Co2.
PwnyPony
Silly Pony - Celebrated the 13th anniversary of MLP:FIM, and 40 years of MLP!
Shimmering Smile - Celebrated the 10th anniversary of Equestria Girls!
Solar Supporter - Fought against the New Lunar Republic rebellion on the side of the Solar Deity (April Fools 2023).
Crystal Roseluck - Had their OC in the 2023 Derpibooru Collab.
King Sombra - Celebrated the 10th anniversary of The Crystal Empire!
A Lovely Nightmare Night - Celebrated the 12th anniversary of MLP:FIM!
Elements of Harmony - Had an OC in the 2022 Community Collab
Non-Fungible Trixie -
Kinship Through Differences - Celebrated the 11th anniversary of MLP:FIM!
Verified Pegasus - Show us your gorgeous wings!

☀Welcome Princess Celest
@BK_Leonidas  
She could be breathing on the air that was already in the jar when the lid was put on.  
Though the air would eventually become to thin to breath.