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  • Hey there and welcome to Life Noggin.

  • Wouldn’t it be cool if there was something that could survive space without a special

  • suit?

  • Well it turns out there is something that awesome, and it’s called a tardigrade!

  • They may sound like something you get when youre late for school, but these little

  • guys are basically superheroes!

  • Let’s find out why.

  • Tardigrades, or more adorably known as water bears and moss piglets, are a phylum of small

  • invertebrates that are bilaterally symmetrical and have four pairs of legs.

  • They like to munch on things like plant cell fluid and bacteria and try their best to avoid

  • their predators, which can include other tardigrades!

  • That’s right, some tardigrades are cannibals!

  • Talk about trust issues.

  • But just why are these little guys so scientifically awesome?

  • Well, it turns out that our moss piglet friends are super resilient and can survive some pretty

  • extreme conditions.

  • They can handle super cold environments, like ones colder than - 200 Celsius, and also ones

  • as hot as around 150 Celsius!

  • They can also survive extreme radiation, oxygen depletion, and also severe pressures.

  • Some scientists even think they will outlive humanity!

  • Tardigrades are also thought of as one of the few lifeforms that can survive the harsh

  • conditions of space since they have lived at Low Earth Orbit.

  • In 2007, samples of tardigrades were exposed to a space vacuum and two different ultraviolet

  • radiation spectral ranges.

  • All of the tardigrade samples were exposed to both ionizing solar and galactic cosmic

  • radiation.

  • The solar radiation negatively affected their chance of survival, but amazingly, some of

  • these little fellas were still able to survive!

  • So how do they do it?

  • It’s all thanks to a process called cryptobiosis.

  • Through this, tardigrades practically stop all metabolic processes and can survive for

  • years in this state.

  • They can dry up into a lifeless ball in what scientists call a “tun”.

  • They stay in this state until they come into contact with water again.

  • It’s basically the extreme version of playing possum.

  • I don’t know about you, but I’d love to meet one of these superheroes.

  • Ohwell that was easy.

  • But I’d love for my human friends in the real world to meet one too!

  • Turns out you might be able to if you have a good microscope.

  • According to some sources, including the awesomely named International Society of Tardigrade

  • Hunters, if you want to see a tardigrade for yourself, go out and find some lichen or moss

  • and place it in a shallow dish.

  • Let it soak in distilled water overnight and in the morning, squeeze the moss over a transparent

  • dish, like a Petri dish, to collect the water.

  • With any luck, you might be able to examine the water under a microscope and get to meet

  • one of these awesome water bears!

  • I’m going to name mine Heimlich.

  • So what do you think about these little guys?

  • Let me know your favorite fact about tardigrades in the comments below and let me know of any

  • other amazing animals you’d like to learn more about!

  • Make sure you come back every Monday for a brand new video.

  • As always, I’m Blocko and this has been Life Noggin.

  • Don’t forget to keep on thinking!

Hey there and welcome to Life Noggin.

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B2 中上級

みんなが死んだらどんな動物が生き残るのか? (What Animal Will Survive When Everyone Dies?)

  • 129 12
    吳晟光 に公開 2021 年 01 月 14 日
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