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shoo04/03/20256 repliesview on HN

> enough Thinkpads on Earth to probably stretch end-to-end around the moon and back

  LD, average distance between Earth and Moon = 384,399,000 m  [1]
  C = circumference of moon = 10,917,000 m

  R := approximate round trip distance = 2LD + 0.5*C = 774,256,500 m

  n = total number of thinkpads on earth <= total number of thinkpads ever manufactured = 250 million [2][2a][2b]

  W = width of thinkpad = 0.3366 m  [3]

  T = total thinkpad distance = n * W <= 84,150,000 m

Alas, T / R, the ratio of total thinkpad distance T to our lunar round trip distance R, is at most about 0.11 .

This is with the optimistic assumption that the total number of thinkpads on earth equals the total number of thinkpads ever manufactured. A more conservative estimate might be something like n = total number of thinkpads manufactured each year * mean lifespan of a thinkpad = (12 million thinkpads / year) * (5 years lifespan) = 60 million thinkpads in good working order for a lunar round trip.

  [1] https://en.wikipedia.org/wiki/Lunar_distance
  [2] IBM sold 25m thinkpads before selling product line to Lenovo. By 2022, Lenovo had sold 200m thinkpads. With linear extrapolation to 2024 that gives approx 250 million thinkpads manufactured.
  [2a] https://en.wikipedia.org/wiki/ThinkPad
  [2b] https://www.forbes.com/sites/timbajarin/2022/10/05/celebrating-thinkpads-30th-anniversaryan-insiders-perspective/
  [3] assume every thinkpad is a T480. https://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad_T480/ThinkPad_T480_Spec.PDF

Replies

xnorswap04/03/2025

It won't get you to the moon, but you can squeeze out a little more distance by arranging them corner to corner.

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metalman04/03/2025

Comment on the comments.....it sure looks like moores law is loosing relevance and that going forward the possibility for durable, stable, device implemtations, that can last for generations is inevitable. Manufacturers may be resistant, but with 8~9 billion customers, and the inevitable losses and damage to devices, it will take a generation to get one in everybodys hands

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setopt04/03/2025

Almost terrifying that the two length scales are only an order of magnitude apart…

uticus04/03/2025

opening the thinkpads will add ~ 38% to the effective area of stacking thinkpads, if edge-to-edge (0.2325m depth closed, assuming doubling for opened = 0.465m opened) [0].

if opened and touching corner-to-corner (~0.574m), will add ~ 71% to effective area.

[0] https://www.lenovo.com/content/dam/lenovo/pcsd/north-america...

linacica04/03/2025

Well not the moon, but about 100 times back and forth to ISS Average distance of ISS 370-460km, let's take 415km, back and forth so 2x 415km= 830km 84 150km/830=~101

4k93n204/03/2025

brilliant comment. dont forget theres also thinkpads like that W700ds that had secondary displays that extended out from the side haha

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