ELI5 Elevators - is the door close button a placebo?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

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The trick to powerful public speaking | Lawrence Bernstein 17:27

20 weeks پیش17:27

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17:27

Why do so many of us get nervous when public speaking? Communication expert Lawrence Bernstein says the key to dealing with the pressure is as simple as having a casual chat. He introduces the "coffee shop test" as a way to help you overcome nerves, connect with your audience and deliver a message that truly resonates. After the talk, Modupe explains a similar approach in academia called the "Grandma test," and how public speaking can be as simple as a conversation with grandma. Want to help shape TED’s shows going forward? Fill out our survey ! Become a TED Member today at https://ted.com/join Learn more about TED Next at ted.com/futureyou Hosted on Acast. See acast.com/privacy for more information.…

۲ سال پیش 8:51

MP3•خانه قسمت

Why does every elevator have a "door close" button if almost none of these buttons actually work? Is it a placebo? Why do some elevators have an up and a down button on their door, when they call the elevator to your floor regardless? If an elevator is falling to the ground, would jumping right before it hits save your life? Why do engineers say a space elevator would have to be built at the equator?

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Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: benignevil, elev8torguy, different_secret4912, ansuz07, captainpatent, flexipiezo, tomrlutong, ravingrook and professorferox

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