Editing 2478: Alien Visitors 2

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A {{w|blimp}} is a lighter than air aircraft with no internal structure. These aircraft were traditionally filled with hydrogen gas to provide the needed buoyancy, due to the lower density of hydrogen and a US monopoly on helium limiting availability for the German blimp manufacturer. Hydrogen is highly flammable and thus presents a safety issue: however, its use has gradually increased, considering that it is far cheaper than helium. The famous {{w|Hindenburg_disaster|''Hindenburg'' disaster}} is widely seen as a reason hydrogen airships are unlikely to be widely accepted. However, it is still disputed whether the hydrogen or the coating of the airframe caused the fire. Blimps are still used today, but only rarely, in niche applications, such as for advertising or for aerial photography/videography. Modern airships generally use helium as a lifting gas, which is more expensive, but non-flammable.  
 
A {{w|blimp}} is a lighter than air aircraft with no internal structure. These aircraft were traditionally filled with hydrogen gas to provide the needed buoyancy, due to the lower density of hydrogen and a US monopoly on helium limiting availability for the German blimp manufacturer. Hydrogen is highly flammable and thus presents a safety issue: however, its use has gradually increased, considering that it is far cheaper than helium. The famous {{w|Hindenburg_disaster|''Hindenburg'' disaster}} is widely seen as a reason hydrogen airships are unlikely to be widely accepted. However, it is still disputed whether the hydrogen or the coating of the airframe caused the fire. Blimps are still used today, but only rarely, in niche applications, such as for advertising or for aerial photography/videography. Modern airships generally use helium as a lifting gas, which is more expensive, but non-flammable.  
  
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{{w|Tetraethyllead}} ((CH<sub>3</sub> CH<sub>2</sub>)<sub>4</sub>Pb) is a chemical added to gasoline (mostly from the 1920s to the 1990s &mdash; although some countries [https://web.archive.org/web/20171115235249/http://wedocs.unep.org/bitstream/handle/20.500.11822/17542/MapWorldLead_March2017.pdf?sequence=1&isAllowed=y still use it to this day]) to prevent {{w|engine knocking}}. Lead is toxic and bio-accumulative, and there's substantial evidence that its use in gasoline caused widespread lead exposure, impacting public health on a huge scale. The aliens seem surprised to learn of these toxic effects, and their concern implies that they may be using leaded gasoline themselves, but it's unclear whether they might think that their biology may by vulnerable to lead as well or whether they never considered that biologies alien to theirs would be.
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{{w|Tetraethyllead}} ((CH<sub>3</sub> CH<sub>2</sub>)<sub>4</sub>Pb) is a chemical added to gasoline (mostly from the 1920s to the 1990s &mdash; although some countries [https://web.archive.org/web/20171115235249/http://wedocs.unep.org/bitstream/handle/20.500.11822/17542/MapWorldLead_March2017.pdf?sequence=1&isAllowed=y still use it to this day]) to prevent {{w|engine knocking}}. Lead is toxic and bio-accumulative, and there's substantial evidence that its use in gasoline caused widespread lead exposure, impacting public health on a huge scale. While it is unclear whethere this chemical is also harmful to the aliens, they seem surprised to learn of these toxic effects, and their concern implies that they may be using leaded gasoline themselves.
  
 
The final invention appears to be a reference to {{w|Juicero}}, a defunct and short-lived brand of juicer, which has become iconic of the absurdity of modern technology investment. The company produced a high-tech, internet-connected juicer which sold for $700, and only worked on the company's proprietary branded single-serving bags of pulped fruit, which were available by subscription for $5-$7 per serving. The company raised over $100 million in startup capital, but quickly went out of business because most consumers considered the expensive product to be nearly useless, coupled with a rather damning [https://www.youtube.com/watch?v=5lutHF5HhVA video by Bloomberg] demonstrating said packets could easily be squeezed by hand. The title text singles this invention out, calling it one of the "mistakes of the past".  
 
The final invention appears to be a reference to {{w|Juicero}}, a defunct and short-lived brand of juicer, which has become iconic of the absurdity of modern technology investment. The company produced a high-tech, internet-connected juicer which sold for $700, and only worked on the company's proprietary branded single-serving bags of pulped fruit, which were available by subscription for $5-$7 per serving. The company raised over $100 million in startup capital, but quickly went out of business because most consumers considered the expensive product to be nearly useless, coupled with a rather damning [https://www.youtube.com/watch?v=5lutHF5HhVA video by Bloomberg] demonstrating said packets could easily be squeezed by hand. The title text singles this invention out, calling it one of the "mistakes of the past".  

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