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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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