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We all know to stay away from poisons like mercury where ingesting a 200mg dose would kill you.
or polonium, which only requires one gram of vaporized substance to wipe out 50 million people
But did you know that 70 cups of coffee contains
enough caffeine to kill a 70kg person?
This amount of caffeine can trigger heart palpitations or even cardiac arrest
Prefer alcohol as your beverage of choice?
13 consecutive shots could be lethal too.
Because alcohol is a depressant,
the area in the brain controlling basic life functions
like breathing and heart rate begin to shut down
Too much liquid in general can be dangerous as well
Though it takes a lot, water intoxication from around 6 litres causes brain cells to swell
leading to headaches, seizures, comas, and even death in extreme cases
But if you stop drinking water, or consume too much salt
your cells will start to shrink, leading to the condition known as hypernatremia
48 tsps of your favourite seasoning at once
is enough to trigger this reaction
also leading to seizures, coma, or even death
Stick your head under water or simply hold your breath
and it takes around 4 minutes without oxygen to cause severe brain injury
and at 6 minutes, you could die
However, in extreme cases, some free divers have been able to hold their breath for over 20 minutes
Cherries can also deprive you of oxygen
Say what?
If you ever swallow a cherry pit, you shouldn't worry too much
just don't bite into one
One or two ground cherry pits contains
enough cyanide to take you down
and these cyanide ions inhibit the enzyme Cytochrome C Oxidase
causing your cells to be unable to use oxygen
Speaking of a lack of oxygen,
it's at around 8000ft above sea level that
our bodies can no longer acclimatize to the limited oxygen
This is known as the "death zone" in mountaineering
Simply being too tall can also kill you
In the 1930s, Robert Pershing Wadlow reached 8'11"
This height put severe stress on his circulatory system
and structural pressure on his bones
and he died at the young age of 22
Researchers have hypothesised that every inch above 5 feet takes 1.3 years off your life
If you're worried about your pet's life, you may have heard not to give them chocolate
The same chemical, Theobromine, can kill us too
Our bodies metabolise Theobromine more effectively though
with 1000mg/kg being lethal to humans
which is the equivalent of 85 full-sized chocolate bars at once
You may want that many chocolate bars after getting high
however, you would need to eat 22kg of marijuana to be at risk of death
Smoke it, and the amount required to overdose is comically high
Approximately 680kg of pot within 15 minutes would induce a lethal response
Which may explain why there has never been a single documented death
directly linked to consuming too much marijuana
Blasting some amazing music may be fun as well,
just don't go above 185 decibels
The amount of air pressure from this could burst your lungs, or
alternatively, create an embolism that travels to your heart
It may also keep your neighbours up all night
And, while it's uncertain how long the body can survive without sleep,
studies on rats who underwent continuous sleep deprivation
lasted around 2 weeks before dying
The world record in humans is just over 11 days
but surprisingly no long term effects were documented after he caught up on his sleep
Got a burning question you want answered?
Ask it in the comments or on Facebook and Twitter
And if you liked this video
check out our previous one called "This is 200 calories"
where we break down and compare different foods and drinks
to put things in perspective
Be sure to like, share and subscribe
for more weekly science videos




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Ryan 2016 年 4 月 1 日 に公開
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