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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

We all know to stay away from poisons like mercury where ingesting a 200mg dose would kill you.


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